I am not a big fan of either person in this twitter battle. Biles attacked Gaines several times in very personal ways and does not attack Gaines' stance on a serious issue. Biles' body shamed (and in a stupid way) Gaines. Something I find surprising coming from a woman in a sport where body shaming is rampant. (Also the "pick on someone your own size" is funny since Gaines is 5-5.)
People think just because Biles has won a lot of medals that her opinion is more valuable or better reasoned than Gaines'? Well Martina Navratilova is (arguable) Biles' equal in sport accomplishments and sides with Gaines. How do those who believe this reconcile that?
There is a lot I do not like about Riley Gaines. I fall on her side regarding protecting women's sports, but apart from that I find her repugnant.
Gaines did start this battle due to her being harmed by a transathlete. That is normal. People often take up a cause because of some personal connection. Biles, as near as I can tell, has never been in a competition with a cis-male.
I am ignoring the whole Biles would beat any male gymnast since they play by different rules and scoring. But it would be interesting to see the vault and floor competed in one division to see. (Women, smaller women anyway, have certain advantages in many aspects of gymnastics over men.)