The forum is already on a slippery slope due to the unrestrained "venting" that you want to defend. Venting is never funny, insightful and adds nothing to the forum; it's just an excuse to throw shit at our players, our manager, our coaches, our physios, our ownership and on and on... Defend toxic posters all you like, inventing spurious numbers to your argument only weakness it.
Personally after a game I'd expect my posts can be overly critical but by the next day I'm back to just posting none offensive nonesense.
My view is if someone praises when it's good but is critical when it's bad I don't really see the problem, what I don't agree with is agendas and constant negativity, must be a sad life to only care about misery.
I have also stopped putting footballers and managers on a pedestal, they earn far too much money, aslong as it doesn't cross a line then a bit of criticism should be more than fine.