1. None. There are animals I wouldn't care to eat (e.g. primates), but none of them are on offer where I live.

2, 3, 4: N/A. On (3), though, when I have to avoid things that personally disagree with me, I don't expect a waiter to be able to definitively answer questions about the precise ingredients of a dish. I guess conservatively from the menu description.

5. No, I don't try to persuade anyone to omnivorousness.

6. N/A.

7. I might ask them why. Or not.

8. Brought up as an omnivore.

9. N/A.

10. My metabolism appears to be several standard deviations removed from the norm in several ways, so I pretty much ignore all dietary advice beyond "a little of what you fancy". It works, so I don't fix it. No strong moral attitude.