When I first thought about being vegetarian I continued to eat fish, because in Australia that's what you do. But in India they laughed their heads off at the idea that I was vegetarian and still ate fish. Eventually I succumbed to their peer pressure and stopped eating fish.
Now I am being brainwashed further into considering giving up the eggs. As much because I don't enjoy the taste or 'feeling' of eggs. Too meaty for me. I continue to eat them occasionally, mostly cause I don't like being too fussy or antisocial, and eggs can creep into anything, even mentos!
Classic vegetarians including Pythagorus and Gandhi excluded eggs from their diet, and generally people like that are onto something good. So I am happy to follow their lead.
I have no intention of giving up dairy, none whatsoever-don't even try making me!