I hate when teachers do this! Depending on the student, that kid might never raise their hand again. My math teacher (who was also the football coach) would make a joke every time I asked an earnest but stupid question, eliciting laughs from all his players.
My teachers would constantly compare students with their siblings who might be older or younger or even sometimes in the same class. The other sibling was, of course, always better.
I'll take "How to encourage sibling rivalry" for 500! I empathize, in some ways this is worse.
That is just awful teaching as well as unkind.
It is now for sure. Back when I was in school it wasn't at all unusual.
Same friend, same.
Guess what turned out to be my worst subject? To this day, I still have math anxiety.