Yeah I'm not sure what the answer is. I suppose critique means critique and it has to always be honest to have any value. It can hurt, I hate getting negative or 'meh' feedback on the 'song' (as opposed to the technical side like the mix) but I prefer that to having smoke blown up my arse, because I really care about the quality of what I 'release' (for want of a better word) and besides useful technical critique this place is also a good sanity check.
Preventing trolls and insults is obviously important but that's different to direct, honest feedback which may seem negative just because that's the honest opinion. The tags maybe wouldn't really direct the type of feedback, but more likely determine whether or not actual critique is wanted and given....as opposed to support. In truth the only tag for 'critique' should be 'be honest with me'.... although tags will be often be ignored, as will written guides/rules by management or an opening post asking for critique only on a certain element, so ... guides and tags are useful but whatever happens you just roll with it, and all critique and opinions are useful in some way provided they're honest but still you take what you want to take and ignore what you want to ignore. If anyone packs their bags because they got a negative comment then for one reason or another they probably shouldn't have been there in the first place...the rest of us will either ignore or learn from such comments, even if not always initially thankfully.
I dunno, being creative can be depressing and lead to some hurt at times no matter what.. it's just the way it is... it's a sh1t biznis.
I'm in two minds as to whether clearly false positive 'nice' comments should lead to the reviewer being called out or not.... I suppose there's a place for it, some people just won't be helped by honest critique, and we can never be sure we know what someone else honestly thinks, but there are times when it bugs me... a bit