The truth is that I write in multiple genres. Icky bug is just one of them. Unlike you, BigWords, I have no big beef with genres as they give readers, including me, some idea of the subject matter. However, I do agree that just because I may dislike a particular genre or subgenre, vampires comes to mind, doesn't mean I condemn or put down those authors. I also can't stand to read first-person stories unless they're non-fiction. Those are just personal preferences, but I have no right to condemn another author that wishes to write that genre or style. Bravo for them. I've missed out on this infighting you mentioned but if I saw it, I'd probably just ignore or avoid it anyway. It's counterproductive and serves nobody. It really burns me that the professionals do this as much, if not more than fellow authors.
These bad attitudes pervail in the marketplace among publishers and agents, unfortunately. It's really hard to find someone to take a fair look at your work, no matter how well written just because of the subject matter. Lately, I've been marketing my icky bug MSs as "supernatural thrillers" instead of "horror" just because it is more "politically correct." I prefer "icky bug" but since it's my term, I usually get raised eyebrows or blank stares so I have to go with the flow, especially since there are no "icky" bugs, literally, in the stories. Monsters, yeah, but no bugs.
In the other genres I write, I don't get this kind of flack. Even when the agent or publisher says they accept horror, I often get it. I really hate when they say horror but it turns out they want cushy cute vampires or some kind of Christian horror which I haven't the foggiest notion about.
Oh well... forge ahead. It's all we can do.