I guess it can be, but teasing can also be a form of ... I dunno, affection? Fun? Healing? And in some cases gentle correction, at least/especially between parent and child. I noticed that friends tease each other a lot and laugh over it, but I don't really relate to it myself. I think it's only funny to be teased because people's egos are so inflated.

Just friends or people that know me well. I don't like when coworkers I barely know make light hearted comments.

I am used to be teased by people with whom I feel close plus people I did tease myself a little bit and with whom I feel close exactly for this. When I tease you a wee bit and you laugh and like it, I will feel closer to u and vice versa. I remember a little game of teasing and teasing back with a new acquaintance that had lovely results during the night and the next day .. your milage can vary ;-)) but it was just that single instance years ago, so it isn't guaranteed to spark each time.

Don't like to be teased other than siblings

As long as it is not mean-spirited i don’t mind. I would have to feel close to them for this to be acceptable. I think it can be a form of aggression in which the aggressor can always say, “ oh... but I was just joking... why are you so sensitive?” Making it appear as if you have no reason to be upset. I like to tell my kids that if only one of us is laughing or enjoying it, then it’s not just playing of joking around.

Yeah, people I'm close to, I will tease them and they'll tease me back. It's a way I show affection because I wasn't trained properly :-P

I try to stay away from doing it to people when we're not close or I'm not sure how they are going to take it - in those situations it could be a way of asserting yourself over someone, maybe trying to use their insecurities against them