Jim,
You fit in.
There are those comments offering constructive criticism, and those that just criticize. Being told you did a lousy job without knowing or understanding what is at issue does not encourage improvement. It doesn't help when the criticism is terse or smarmy and comes from someone with years or even decades of knowledge and experience and doesn't want to offer advice (especially when they admit to finding it tiresome. To them I ask, then why are you here?)
Sometimes, too, even the best-intended critique can bruise our egos, especially when we or are unfamiliar with each other. In those moments, it can be tough to get past the emotional reaction and try to learn from it.
I have been on both sides of this, both on this forum and others. I'm more of a lurker here, because I don't feel my skills or knowledge run deep enough to contribute much. So I read, and learn. And share what I can.
But I'm always trying to elevate the hobby. Isn't that ultimately why we're here?