I never understand why people that aren't vegetarians care so much about this sort of stuff. I'm not a veggie, I'm a meat eater, but if someone eats this and doesn't eat that I don't care. But you get these people that are so massively wound up about why people choose to be veggies, or if they say they're veggies and eat fish oh what a crime etc, who cares!
We all have things we eat and things we don't eat, I don't eat pork but I eat bacon, this causes massive consternation to some people, they are like "well its still PIG how can you eat bacon and not eat pork you HYPOCRITE", my answer is I find pork heavy and stodgy and never liked it but I like a nice bit of crispy bacon on a sandwich...just personal taste, but to some people this is serious business and they have to spend ages arguing to me why I should eat pork.
Yes maybe veggies that eat fish are hard to categorise, its like if someone's bisexual....oh no...are they GAY?? or just CONFUSED??? If you let yourself get wound up about these things you can waste hours from your life that you will never get back.