DPS is the job of DPS.

[Sorriow]

Of all of them, "easy" isn't.

Given that most dungeons are easy by default and are pretty heavily gimped down by the players gear level / max itemsynch, the element of challenge outside of savage content is reasonably low. As I mentioned in the post you're quoting but sadly/conveniently cropped out, people are more often than not encouraged to improve and the attitude ranges widly between grateful acceptance for advice and rudeful spite.

I have never, in my >15 years of mmo experience, witnessed a moment where people, outside of the hardest endgame content, get shamed for asking for advice and actually use it to turn them into a better player.

The real problem lies with people who straight out refuse to optimize. Check my other post, there are multiple reason why that is an issue.

Bottom line: If you don't want/try to push the best out of you, you have it coming to get shamed/insulted/kicked out of a party in a multiplayer setting.