Recognized for something you might be trying to hide or disguise. Like a drag queen who is so convincing as a female impersonator that no one can clock that that’s a man.

https://www.reddit.com/r/rupaulsdragrace/comments/4k50u7/dummy_question_but_what_does_ru_mean_by_being/

Assumes that the drag queen in question is a cis male impersonating a female, not a trans person who does drag.

I think the implication would be that OP were not openly being a cat person, but the other person recognized them as a cat person from other tells