If I understand you correctly OP, you are not looking for ways in which to (better) support your child, emotionally/socially/academically. You are looking for support for yourself - people you can talk to who have similar experiences, as you find you cannot talk about your child to parents who don't have gifted children as you usually are judged. Challenges you experience in your social circle, not challenges regarding how to deal with your child's needs. Is that right?
My children are probably not 'gifted' though DS is pretty able. I find it quite difficult when someone says something to me such as 'Oh, your DS is so clever at x' or 'I'm not surprised he's good at y'. It feels mildly confrontational, as if they're looking to see how I will react - will I minimise my DS' achievements? Seems to be the expected thing to do (he has been lucky/he has been working hard (as opposed to just picking it up easily, which seems offensive to some)/he's not really that good at it/...) Or will I make the mistake of bragging? I don't want to minimise his achievements nor do I want to be seen as bragging, so I usually try to evade somehow. But I am sort of a literal person and generally find evasion hard, my natural reaction is to try to respond precisely to the question asked/statement made. But when I do, people judge me for 'bragging', I feel.
I also observe quite a lot of bonding happening between parents over complaints/moaning about how hard/time consuming e.g. school homework is, but cannot join in with that as DS gets away with minimal effort/time investment and still gets great results.
But if I were to moan about how DS is left to coast I would get a very different reaction.
Is that the kind of thing you mean?
On G&T board here you sometimes can just 'moan' and talk about the challenges you experience, but often people try to actually help/give advice, and you cannot really blame them for that. As happened here - PPs were genuinely trying to be helpful I think, addressing some of the things you mentioned, whereas you seem to not be looking for advice, if I understand you correctly.