Mean or justified?

Is it mean to pour water over a coworker if they have attempted to do so to you twice earlier in the evening? Because that's what I did at work last night. Granted, it was dirty water from a pot I'd been scrubbing, but Matt's guard was down for the first time all night! And believe me, he so deserved it. Earlier in the night, after throwing mussel shells at me, he told me he only picks on us girls who are dishwashing because he expects us to fight back. Well I fought back, baby! Mwahaha. But don't worry, everyone. He's not a server, he's a dishwasher as well. I would never pour water over a server; i'd probably get fired. But it was really funny how everyone he told, they just laughed. No one's on his side, poor baby.
Sad, that pouring water on someone is what I'm writing about. But I've really loved working at the restaurant. Most of the time, I've been working with people a year or two younger than me, so I've gotten in touch with my immature side (hence the water pouring) but I also got to know some of the servers, who are a few years older than me. Anyway, it's been fun. Only a few more weeks of summer left, and only about a month left working at the restaurant (sad face).