to be honest I think even amy rose from sonic could be considered a tsundere, I mean sure she doesn't hit sonic often but when she does its usually for him doing something stupid, especially for example in that one sonic riders game where he blew her away with eggman in the whirlwind when he was supposed to be saving her, and sonic x makes her seem even more like a tsundere.
heck even misty from pokemon is one, and she gets hate too, why the flip do people hate tsunderes so bad for the hitting, why can they seriously not understand its a joke and a form of slapstick?!!
People see what they want to see, if they see someone hit someone for comedy, they think it's abuse. I'm going to throw in a Naruto example:
Sakura hits Naruto when he's being pervy or stupid, he's not hurt in end, he just looks really goofy with his face messed up or whatever. The chick that Chouji is now married to beats the crap out of Naruto when he's defending Sasuke.... THAT'S ABUSE. Naruto was bloody, bruised, and Sai had to get her to stop. Does anyone ever stop Sakura? No, because it's not even meant to be harm....
It seems all the tsunderes get hate from every show because they are "abusive" and don't take crap. That or they got a flat chest and act like too much of a tomboy. I believe the majority of the hate comes from fanboys that want some sweet, submissive woman with the main character, because they (the fanboys) usually view themselves as that character or want to be that character.
I seriously wonder if they think real life Japanese girls are like that, like they are all just a bunch of big boobed, (sometimes) scattered brained, walking doormats.