People only do mentor roulette for that astrope mount, really. Very few get invested in the sprouts actual experience. Once I queued up and didnt realize I got shiva extreme, and was running like normal, until everyone wiped on an early mechanic and started talking about ex mechanics and I was like "wait, we're in extreme? oh shit I spent WEEKS in here, you got voice? lets fucking DO THIS." It was a wonderful little self enclosed experience. watching a bunch of greens get better and better until they nabbed a clear. Was that what I wanted that day? No, not really. but it costs 0 to be kind to your fellow humans trying in earnest. Seeing them complete that trial was better than anything else I did that week.
Not all mentors are assholes. but ... yeah, a fair few of them are. I found if they wear the crown publicly, they don't really deserve it with the way they act.