Look at almost any thread with similar comments it's mostly people saying how much they love meat vs. anyone saying anything about them being vegan. Vegans politely mention their diet in real life more than other people because it limits the places you can go out to eat, and they don't want to make things awkward. They don't want to show up to your house and refuse to eat the steak you cooked since they didn't mention it beforehand or reject the leather boots you bought them for their birthday. It's better to be upfront about it and people take offensive to this.