Caitlin is a woman basketball player who plays on an all-woman team in an all-woman league. She may be six feet tall (so what, some men players are seven feet tall) so she is not some "trans-man" pretending to be a woman so he can excel at a sport he sucked in when playing with other men.
So we should be celebrating Caitlin's achievement. She's a real woman who is a basketball superstar among women.
They’re upset cause a woman set the record. I guess it would have been okay for a tranny (fake woman)