Those that follow women's soccer, but aren't fans of the WNT generally have one or more of the following reasons:
1) The lawsuit(s) / legal actions about pay. A very brief synopsis of the timeline and basic stances of those involved:
-Way back in 2004 in the aftermath of the collapse of the WUSA, the WNTPA and the USSF negotiated a new CBA (it was expired and needed to be renewed anyway) the changed the pay structure of national team players to having a decent portion of guaranteed income with a lower portion of income from per diems, bonuses and per game appearance fees. This also added official contracted roster spots to the team that players need to be formally released from with the paying of a severance package.
-In 2012 this CBA was extended by a memorandum of understanding (MOU) between the WNTPA and the USSF
-In late 2015 / early 2016 the WNTPA took the stance the 2012 MOU was not intended as an extension of the CBA and that therefore that there was not CBA in place. There were implications that the players might strike in the lead up to the Olympics that year unless their pay was increased to match that of the MNT. The 2004 CBA, extended in 2012 by the MOU had a clause preventing strikes or lockouts for the duration of the CBA, hence the need to delegitimize the 2012 MOU if the players wanted to strike.
-Now an item open to differing opinions: At this time several players made public statements about the differences in the MNT and WNT pay structures that some fans found misleading. These included comparing MNT and WNT revenues in 2015 (a peak year for WNT revenues vs a low post WC year for MNT revenues) to show that the WNT receives a lower portion of revenue than the MNT, ignoring the 2016 Copa America in MNT revenue projections but assuming an Olympic gold medal with CBA obligated victory tour in projected 2016 WNT revenue, overestimating number of games played by the MNT to increase possible MNT player income, and not addressing or acknowledging the structural differences in how MNT and WNT players are paid (MNT players are paid entirely on a per game/camp basis in per diems, appearance fees and bonuses, WNT players have lower per game/camp income but earn an annual salary if they are contracted to the team. This includes full paid injury leave, half time maternity leave and a severance package if their contract with the national team is cut. MNT players do not get these benefits)
-Back to statements of fact: The USSF sued to get the 2012 MOU recognized as valid by a court to prevent a possible strike before the Olympics. This lawsuit was ruled in the USSF's favor
-In late 2016 the WNTPA and the USSF negotiated a new CBA (the old one was set to expire, so this needed to be done anyway)
-In approximately 2017 (I can't remember the exact starting point for this) the WNTPA initiated an investigation by the EEOC (Equal employment opportunity commission, a US government agency tasked with investigating incidents of employment discrimination) into the USSF's compensation of the WNT
-In February/March of this year the EEOC returned it's decision. It did not find the USSF's compensation policies discriminatory and did not initiate any action, but did allow the WNTPA to begin a lawsuit (normally not allowed when under the effects of a CBA). This was somewhat of a "punt" ruling as it did not definitively clear the USSF or back the WNTPA allegations.
-In march of this year the WNTPA initiated a lawsuit against the USSF claiming gender based pay discrimination. This suit is still ongoing.
2) Due to the way the CBA is structured (see above), the WNT has a minimum number of players under contract receiving a guaranteed annual salary, regardless of number of games played. Additional players not under contract to the WNT (and therefore paid on a per game/camp basis) can be called in but only for a small amount of time before they must be upgraded to a contract with the WNT and a guaranteed annual salary. Due to the fact that the USSF is already paying a roster of 20-24 players whether they play or not this is an active financial disincentive to try out newer younger players. Added in that removing a player from contract (to replace them we a younger abler player) necessitates the paying of a severance package and older players can stay on the team getting playing time well past the time the team should have moved on. All of this means that player turnover is much lower than in the MNT and there are always a couple past their prime players every tournament included on the roster in favor of younger plays not yet under contract.
3) In conjunction with items 1 and 2 above, some fans perceive an aura of entitlement from some of the players. Other behaviors that are perceived as supporting this assessment include: Players reportedly petitioning for a getting a regulation in the NWSL that no player not on the WNT may receive a higher NWSL salary than a WNT player receives from the NWSL (ie if the minimum NWSL salary for a WNT player is $36,000 then the maximum NWSL salary for everyone else is $35,999), WNT players treating the NWSL as an afterthought/not their real job and skimping on league duties (see Carlie Lloyd taking a month to return to the Houston Dash after the last WWC, Hope Solo retiring from the Seattle Reign as soon as her cut from the WNT meant she wasn't getting a bolstered NWSL salary), poor player behavior not being reprimanded by the USSF (Hope Solo and the van incident), and players having previously undermined and ultimately ousted coaches that were willing to call in a wider field of players (Tom Sermanni)
Obviously a lot of this is open to interpretation and one person can dislike some of the above behavior by WNT players while another person will look at the above and say the WNT players have done nothing wrong.