How many mistakes are too many?

[Coletergeist]

And that's why people hate on elitists. Because of that arrogance right there. Do not call other players dumb just because they take time learning. ANYONE can master the mechanics eventually if by muscle memory or remembering it. You're not special because you can pick up on raiding faster than others.

You didn't read what they said.
If a player is having that much of an issue, they should try again later, possibly watch a video, something.
They said "if they keep messing up" in which I agree, because by that point, said player is wasting everyone else's time.
It's not shameful to try again later, and it certainly doesn't make folks like that "elitist & special".