Probably because vegans bludgeon anyone who calls themselves vegetarians, because apparently we're worse than carnists because we see that there's a problem yet only go partially through with the solution.

Like I've tried going vegan before, but after a few days I get really cranky and then the cravings start and I end up crashing. I never made it a full week, and it made it harder to even stick to vegetarian foods.

But apparently I'm a terrible person if I ever call myself a vegetarian within earshot of a vegan...

Also there are some obnoxious asses out there who insist that it's really "ovo-lacto-vegetarian" because apparently vegetarians only eat plants? I'm like no, that would be vegan.

Not that it's ever been convenient to be vegetarian. But now you get hit from both sides...