How to finger a feminist

Alright, listen up, smarty-pants! This joke is all about wordplay. "Finger" usually means touching someone, but in this case, it's used in a sneaky way. The punchline twists it into just shaking hands and using a name. It's funny 'cause it's unexpected. And Theresa? Probably just a random name to make it sound even less like you're actually tryna touch somebody inappropriately. Also, the author of this joke? Probably thinks dish soap is spicy.