They are aware. They have had them pointed out.
It is an excuse, even if you didn't mean it.
Unfortunately social media has become the standard platform to address anything, and social media is mediated to exacerbate conflict for engagement. We, all of us, have been conditioned to produce replies, posts, responses to elicit the maximum outrage, chuckles, and gatchas, groomed by the likes, RTs, and other interactions they garner. Social interactivity has been fleeced by companies for dollars and we are left with piss and vinegar. Some of us are more resilient to this than others, but for younger and younger generations, this method of interaction is standard and expected. It's sad that it has impacted this hobby as well.
But it is up to each of us to recognize it and consciously change to be better people, even if we fall back into it now and again. The problem with liberal though however, is that no one is responsible for their individual failures (no one except the outgroup of course). Every failure is the secondary result of some externality. "They can't help it, because this is like this." This is what a lot of your responses feel like. "Yes, it is wrong, but they grew up like this embedded in this environment blah blah," but here I am, able to fling shit with the rest, but I am choosing to have a respectful dialogue in hopes lurkers following this thread, watching you talk to us, may recognize some of the concerns lodged are worthy of consideration.
That's my goal, at least. Hopefully someone watching can say, "well yeah, maybe I can do better about this." All I can do it hope and take advantage of your decision to jump in.