if one holds by vegetarianism out of “moral” principles and that killing animals for food is “wrong” this is apikorsis gemura.
Suppose you don’t think it is wrong, but it just disturbs you personally? Is that ok?
For example, I think stoning people who are mechalel shabbos is correct, but I don’t know if I would be able to throw the stone in his face and break his eye socket and burst his eyeball. (Was that too graphic?)