Thanks for agreeing with me, tahini and QB!
About screaming at people, the only situation I can think of that it may be okay is when the person in question is someone you know well enough and respects you enough to take your “screaming” the right way, and understands you are doing it because you care about them. Other than that, one should never scream at another person. And DEFINITELY not at someone you don’t know. The vast majority of people wouldn’t respond well to being screamed at by a complete stranger. It just doesn’t work.