In casual content I don't really care if others do mistakes, because I'm very bad at explaining things. I only do it when I know how to phrase it right. If I don't know how to say it I hope others will. If someone repeatedly wipes the group I just secretly wish someone is good enough to explain it if I can't or just makes a votekick/abandon. Or I'll leave.

In harder content I try to explain things the best I can, but most times others are more willing to than in casual content anyway.
I remember when I was in a Memoria Miseria clear party a DPS wiped us repeatedly because he always went to the wrong marker. He felt so bad and embarrassed, but I encouraged him to stay and switch markers with him, and eventually we cleared it.

I also remember when I practiced Seiryu ex and was messing up the mechanic where the healers have two stack markers. I wiped us like three or four times in a row. I also felt really, really bad for it. I was so happy that my party was understanding, explaining it slowly to me again. My problem wasn't that I didn't understand the mechanic, but I just forgot when it happened. But talking about it made my brain remember it every time from then on.

But I've had so many people leave after like 2 mistakes in a learning group. I think you can't just generally say how many mistakes are too much. I'm very patient unless the player doesn’t even try at all. Others are not. Maybe something in between is the right way?