To be fair to UKC, most of the complaints about the soda-straws did mostly come from one person, not the forum itself, and that person was the DCA Conservation Officer at the time - who has subsequently died. And it was a trespass beyond a locked gate into a private facility. Not criticising that personally, as it wasn't public knowledge, but some folks will always have a beef about that sort of thing if they do find it wrong.
Agreed, many of the UKC discussions degenerate into bickering, but as someone who frequents both 'camps', and genuinely has no preference between caves and mines in terms of what I do (and it's pointless in Castleton anyway), I have to keep in touch with both. None of the cavers I know or work with are ever part of the bickering, which is nearly always just about one topic, and it's usually the same people arguing, so it's hardly the end of the world.