You just do you. I think when people say “bad” they generally mean preachy. That is not most vegans. Just live your life, eat what you want, bring good food to potlucks so that you know you’ll have something.
I will add that mentioning it is not preachy, if you get an overreaction it’s not you. I am omnivorous and would want someone to tell me before a party or outing so that I don’t accidentally invite them to a steakhouse or BBQ joint. I often make vegan food for potlucks just because it’s sort of a baseline, most everyone can eat it.
They are two:
Kimchi grilled cheese, like the video “late night kimchi grilled cheese”. Strain some kimchi, save the liquid. Chop the solid and fry it in butter. Assemble the sandwich with the kimchi between cheese, cheese between bread. Mayonnaise the outside of the sandwich. More butter in pan, and add the liquid from the kimchi. Fry the sandwich in this kimchi butter. So it’s got kimchi fried in butter on the inside, and is itself fried in kimchi butter.
Close second place roast beef and sharp cheddar with sliced sweet onion, on good rye sourdough, with horseradish and mayonnaise. Yum yum yum.