Caitlyn Jenner is wading in the pool of debate surrounding transgender athletes, Radar has learned. Jenner, who is transgender herself, slammed transgender swimmer Lia Thomas, who wants to compete at the Olympics against females. Jenner says Thomas, who was born a male, has “a tremendous advantage over the girls” and that “we have to keep it fair for women.” Jenner added that it is “just not fair” on other performers considering Thomas went through puberty as a male. She also said that the Olympic pursuit makes “the trans community look selfish.” Jenner, a former Olympic champion, called Thoma…