I think about this a lot. It’s not very hard to notice if you learn about body language but a lot of them never learned. The most important thing is receptivity. If you touch someone on the arm and they touch you on the arm or shoulder whatever, then they’re comfortable with you. But if they step away or act differently then they may not be comfortable with it. You should always pay attention to that. I think it’s hard for people to send that message of discomfort because they think that maintaining boundaries is mean. But that attitude needs to change. It’s not difficult or rude to enforce your boundaries. One time I was playing football and some guys were about to fight. I tried to break it up and the guy said don’t touch me and pushed my hand away. I learned that I shouldn’t do that to people I don’t know lmao he doesn’t know me and thinks I could be a threat to him. That’s why you’ll notice when teams get into fights, it’s always the teammates that hold back their own players. And I think the best thing someone can do, not only for themselves but for others as well, is to create healthy boundaries. If they’re decent people, they will learn about personal space and won’t violate it with others they meet in the future.