It’s a great way to get through a crowded bar or concert, but I’ve amended the technique a little. I stretch my arm out and use it to telegraph where I’m headed, pushing my arm ahead of me through the gaps between people, and they tend to kinda naturally make a space with no contact necessary. I’ll only put my hand on someone’s shoulder if they’re totally oblivious or I’d otherwise walk into them, and even then you have to be subtle about the right pressure and length of touching or I could see people getting mad, but I’ve never had someone be upset with a very brief light tap and I’ve used this technique successfully to move myself and my girlfriend (we hold hands and I almost pull her along with me lol) through some tight crowds without ever ruffling any feathers.