"Dish it" as in "dish it out" - served to people, as if it were a plate of food. But the "it" refers to something like criticism, wit, or just smart-alec behaviour. We also say "give as good as s/he gets".

Dish it would be the same as "use it". Another way to word that sentence would be "I can be very sarcastic, so I am looking for a guy who can not only use it, but understand/accept it!"