I Was Reading A Thing Where An American Was Saying That Europeans Are Weird For Putting Butter In Sandwiches

I was reading a thing where an American was saying that Europeans are weird for putting butter in sandwiches and like ??

So, do Americans not put butter in their sandwiches? Like, I get if you’re having cream cheese, or PB&J or something else with a bit of moisture in it, I don’t have butter with that either, but what if you were having, say, a cheese sandwich, a normal one made with just cheese, I’m assuming you wouldn’t have a slice of cheese between two bits of dry bread. So what would you have? Do you use something instead of butter/margarine, or do you just not have that kind of a sandwich?

This might seem a random question, but I actually need to know this for the purpose of writing fanfic.