When Armin Van Buuren is beginning his annual year mixes with an admonition to stop worrying about genre so much, you know we've gone too far.
So knowing the differences is not unhelpful. You're just having boring conversations. It sounds to me like when Trekkies discuss their favorite episodes of which ever series they like, or why they like certain series over others. Or someone that can tell me the differences of hobbit, orc, wizard and the other books by that author. I don't begrudge them their fascination with whatever the topic is, I just find a way to move the conversation or a way to remove myself if that is the more expedient option. I'm not going to go to ComiCon and complain that people are talking about comics. I just don't go to ComiCon. There's no reason to be rude about. So you saying something that you don't care about while someone else does is tiring and unhelpful makes you the tiring and unhelpful person.
If you can't distinguish the differences that other people can, it's not their fault. You can be dismissive and flippant about it, but there is nothing wrong* with people that can. It's right up there with the people that can tell you all of the differences about each of the lures in their tackle box. They are really into while you are not. Stop judging.
*Unless it's about fonts as I just made the opposite argument about fonts.