I was, and still am, surprised by how often people will go into a long rant justifying why they eat meat to me as soon as they find out I'm vegetarian. All the while I'm just sat there, not saying anything, because I literally do not care whether or not they eat meat.
Me being a vegetarian is a personal choice for me and myself only. You do you. I don't care. You don't need to explain yourself to me. It makes me feel so awkward.
People will often ask me why I'm a vegetarian too. But it feels like a very personal and heavy question to ask someone immediately after finding out they're vegetarian... I don't especially want to talk about animals dying all the time and how it makes me sad especially to strangers.
Edit/Addition: It feels like a lot of focus is brought on how vegetarians/vegans force their views onto other people but my experience personally is non-vegetarians/vegans trying to force me into conversations about this topic.