>is kinda mean and should be reserved for when people are being extremely immature. Linus didn't say that.

Isn't being kinda mean Linus trademark?

"Grow up" vs "leave it at high school" is "potato, potatoh" kind of difference...

He did specify high school though, rather than college/university (or a generic like “school” or “academia”).

We’re probably all over-reading this quote but it did come off as a “grow up” comment in my reading as well, intended or not.