Bad/casual players with worse attitudes than the good "elitist" players

[dank1]

Explain this to me, why is it that the players who think they're good (but are actually bad) are the ones who develop worse attitudes than the good players that everyone refers to as "elitists" in this game?
PF is toxic on my server filled with players performing horribly with no real understanding of mechanics spewing venom at the wrong people when a run goes bad only because the person actually messing up is most the time also calling people out with them, I tend to notice these players to be the ones who just got their first clear in whatever content I'm doing or fairly close to clearing.

I've seen this happen in Ravana a lot which is the content I mostly PF just to help newer players get their first clear (this is me being a tank)

An example of this, I usually have my good whm static healer friend (he and I have way more totems than we can ever care for and only do this to kill time so wipes/bad gameplay aren't issues to us) with me helping newer people when all of the sudden people are dying to mechanics and he gets the other healer raging at him for "lack of heals" when people are standing in the fire, all while the same DPS messing up mechanics are the ones shouting at lack of heals and my WHM friend having not only top HPS but also decent DPS as well, how does this happen? and why are the bad players so toxic?