You have got the wrong way around Dbraad, the majority of people support trans people being given the same treatment (not preferential treatment) and opportunities as anyone else. Its the minority that oppose it.
We are not just talking about sports, we are talking discrimination across society, such as trans people being barred from serving in the military.
My issue with trans women competing against women in in competitive sport such as say running and swimming is that in general they will have an unfair psychical advantage, I wouldn't call that a lie, but I would call it unfair. Its somewhat less clear cut in team sports like say women's hockey.
As far as I'm aware some states in America have allowed trans women to compete in sports since the 1970's and it hasn't lead to the end of womens sports. Somewhere between 0.4% to 1.8% of America's population identify as trans, of course that's probably evenly split between trans men and women, and only a small proportion of those people trans women would look to participate in competitive sports, a lot of them would that may consider entering sports would likely be put off from doing some by the publicity it would generate.
It is a potential issue down the road, but right now to say stuff like Biden has ruined women's sports is just a load of exaggerated hyperbolic nonsense.
As for being against it, because you believe its saying "its OK to lie", you must of been up in arms about the insane amount of lies coming Donald Trump sprouted on a regular basis.