That's the case for a lot of "normies", but it really feels insulting to the electronic music fans in general. Unlike say rock nobody's gonna ask you to know every band in existence and every album they put out decades ago, but you should be able to distinguish between major electronic music genres like house, techno, drum and bass, trance, hardstyle and what not. Sometimes the line gets really blurry, sure, but 90% of the time it's pretty easy to know what you're listening to.
The vibe is different, the tempo is different, the people that go to those places are different, pretty much everyone develops some sort of a very specific preference, and European countries kinda "specialize" based off of that. If you want techno, you go to Berlin. If you want grime, you go to London. If you're into house, you go to a beach in Croatia. I'd say the Netherlands are a bit all over the place, but what really sets them apart is hardstyle, which is pretty much not a thing anywhere else. And so on, and so on.
That's not to say you can't find other things in those places, but they're always gonna be a bit more niche and you kinda have to know what you're looking for to find them.