Indeed. I used to have a circle of friends/acquaintances that had a huge number of vegans and vegetarians. I can honestly say I have encountered literally 0 vegans or vegetarians ever mention it unless food was being served. But if food is being served,,,I mean...you really can't avoid having to tell everyone.

On the other hand, I have witnessed a huge number of meat-eaters become insecurely defensive, aggressive, bullying, harrassing as soon as anybody mentions that they don't eat meat.

No, thank you.
No, thanks.
Nah, don't want to have that.
See the thing is I'm a vegan, so none of the things you've offered would work, and I don't want to burden you, so it's okay, I'll have something on my way back.
Yes, these chocolate biscuits aren't vegan. Thanks for trying, but it's okay, I'll manage.