Why do so many people call themselves vegetarian but still eat fish and chicken?

They're stupid and don't understand the meaning of being vegetarian.

I hate when people call themselves vegan but they eat "free range" eggs and "cruelty free" milk. That's not vegan!!!

They assume that "meat" only comes from mammals.

Because they are ignorant. Really no other answer.

They are idiots and hypocrites

I don't eat red meat, chicken, eggs or dairy (just made that switch cause all the hormones screwed me up) but I will eat tuna on occasion. I don't call myself a vegetarian but other people do and I even get called a vegan now, I don't care much for labels. I don't think it matters either way. You shouldn't be a vegetarian just for the label anyway so who cares.

Because they're liars. If they say they are vegetarian but still eat chicken and fish then they are just fussy eaters.

Some people dont understand. If they eat meat they are not vegetarian. If they eat fish but no other meat, they are Pescatarian.

People who do that are often posers, they're just saying they're Vegetarian for attention and to make themselves look sophisticated/interesting. They don't care about the environmental impact the meat industry has or the torture that goes on behind closed doors to innocent animals in the name of greed.