I've also been to a lot of gigs and while I've never seen anyone act like that towards a specific audience member, I did once get someone's crotch unintentionally almost pushed in my face. (This guy would always come closer to the audience and step onto the barricade during one particular song. Usually that would put his stomach at eye height for the audience but at this venue I guess the step on the barricade was a little higher and I got a different body part in my face Also the room was packed so I couldn't step or lean very far back.) Granted it was a different situation because it wasn't intentional - they guy was looking over my head, waving to the people in the back - but in the moment I was a bit uncomfortable. Now afterwards I can laugh about it.
And honestly if a musician did that from the stage to me on purpose, I'd probably just laugh at it as well.

Maybe what you should be analysing instead of "why do these things happen to me" is how your attitude to these events is serving you in life. Is it really helpful to you to still be this obsessed about a situation in the past? And expecting people to ask if you're okay and the musician to apologize and getting upset if that doesn't happen - is that serving any purpose for you? Wouldn't you feel better if you just shrugged things off and tried to move on? You can't expect the entire world to cater to your sensibilities. People are gonna act in ways you don't like, but dwellling on these things will only get you angry and bitter
Is that how you want to be?