I would agree that it isn't a great place to be in, but I don't know that I necessarily agree with the comparison to movies/books/anime/etc. There's always been plenty of places to discuss smaller movies or shows without getting shit on. I guess the closest approximation I can think of might be the people who take Star Wars vs. Star Trek, or Marvel vs. DC, etc. too seriously, but in this case it's basically a subset of 5E players vs. the world, and the non-5E fanbase is significantly smaller so you don't quite have the similar sizing as you would in those examples. For anime, I don't know that I've ever seen the shounen crowd be vehemently against shoujo or seinen/josei.

I would agree that, on the whole, there is more interest in alternate systems because D&D has gotten so popular.