It still is somewhat snobbish intending on the intent. Sure it's not what I normally listen to, but I find things outside of prog that I enjoy, and it's dumb of people to assume others don't like something they do just because of genre. I just didn't find the songs entertaining all the way through, and frankly I thought the delivery was a little cliche and dumb.
I think it's kind of fair. When I read your original post, I thought exactly the same thing ("I would not expect Nick to like them anyway").
I'm not saying you're some kind of prog elitist who thinks all other kinds of rock music are automatically worse because they are less difficult to play or not as long or... You know, some elitist shit.
You just seem to me like a guy who likes what he likes and doesn't like what he doesn't like. Like, I just skimmed your Top 50 Artists thread and it's probably fair to say at least 80% of the bands were prog-oriented. Nothing wrong with that. Doesn't mean you're closed-minded or anything of the sort. That's just what you like and what you're used to.
So when you come into this thread and pass off Arcade Fire - one of the most artistically respected, critically acclaimed, popular bands on the planet - as "nothing to write home about" after only seeing them perform once, I don't think it's so unfair for people to think, "OK. No surprise here."