I think it really takes both having thicker skin and encouraging politeness or general common respect. Hard reality is sometimes someone has to tell a person they are wrong. Or they need to be informed that what there's something better. Maybe it's a technique learned from training or maybe it's a better suited gun for a specific discipline of shooting. Or maybe it's telling someone they need to stop putting their Sig ___ in a generic Uncle Mike's pancake holster and expecting it to be secure.
Likewise, we need to be mindful when sharing info that we need to be careful how we say things. It's hard to get context or intent from written words.
I mostly agree!
However the "thicker skin" talk has been a blanket excuse for those who are part of the problem rather than the solution.