It's been my observation that the least annoying variety of vegetarians are the sort that were raised in a bona fide culture that is vegetarian. Most of the others, especially the vegans, seem to be almost all SWPLs with degrees that don't pay much who are desperately trying to distinguish themselves from the hated proles.
But for the cultural vegetarian, it's no big deal, and they don't get sanctimonious about it, despite the fact that it ACTUALLY IS a religious issue for them.
For instance, a group of my colleagues at work and I were cooking a bunch of freshly caught fish at a team building event some time back. We'd brought along some veggie burgers and the like for the vegetarians in our group. Knowing that some vegetarians have a concern for meat contaminating their vegetables when cooked on the same grill, I inquired of them if they'd like me to cook their veggie burgers first so as to not adulterate them with fish. They all told me, oh, don't worry about that Jehu, just toss 'em all on. You see, they understand that incidental animal material is going to be part of pretty much anything you cook or eat---even just grains. They don't have a complex about it in the way that status-striving Western vegetarians and especially vegans generally seem to. In short, they're Low Church Vegetarians---which is kind of ironic considering that they have a legitimate tradition going back thousands of years. Perhaps it's always the new 'converts' that demonstrate the over-the-top zeal.