I wear headphones regularly as a single. Introducing myself on the first tee is wear I get a feel for the players in the group and if I'm going to wear them or not. Usually the other players are with a buddy or don't speak English so talking is at minimum between us anyways. If you are offended by me wearing headphones while I play is pretty funny. As for me not being able to hear someone yelling fore, cmon really?
and music in the cart does not bother me.