I hate how people tap on my shoulder HARD, just for a MINOR SURPRISE.
Don’t they have any mouths to open to say hi, or hands to wave hi?
Take it. I am surprised, but not PLEASANTLY SURPRISED. It’s like a freaking RUDE SHOCK you would ever give, and I don’t consider that friendly at all.
Not only is it rude and intrusive, it is also freaking unfriendly and pretentious.