Three-time Olympic gold medalist Aly Raisman is calling out an airport security worker who she says questioned whether she had enough muscles to be a gymnast.

Raisman posted on Twitter on Wednesday that after a female Transportation Security Administration worker said she recognized Raisman by her biceps, a male employee said, "I don't see any muscles." Raisman called the encounter "rude & uncomfortable."

Raisman, who turned 23 Thursday, says she works "very hard to be healthy & fit." She says that if a man can't compliment a girl's muscles, he's sexist.

Raisman didn't say where or when the airport exchange took place.