Hmm. It might depend on how much investment you had in H/G - some people would get up in arms about having the ship described as "juvenile and saccharine" - but it would certainly be better to respond by saying "thanks, and have you tried these others that aren't juvenile either?" than get upset about it.

I have trouble thinking in genre or ship categories anyway, though, so I'm the wrong person to ask. I've never understood the people who say "I don't read slash" or "I don't read het" or "I don't read anything set in the MWPP era" - why not just find good writing? - but if they're really irritated or squicked by something then of course they can't be forced to read it. After all, there's an awful lot to read out there even in the fic world let alone everything else, so unless your OTP is McGonagall/Crookshanks and you won't read anything else ever, probably you'll be OK. :)