The idea that vegans just announce themselves constantly isn’t true for the vast majority of vegans. Sometimes you do need to mention it, like when picking a restaurant in a social group with people who don’t yet know you’re a vegan. I do the same as a vegetarian, and I did the same when I was a vegan. You know who was very loud though? Annoying people who interrogated me on how dared I not eat meat (and this was a whole lot more common when I was a vegan). Just stfu.