Is it a post covid thing?
There are outdoor voices and indoor voices and it's really anti social if you don't know the difference.
Today I have been on a bus and train and there have been passengers who are SHOUTING their conversations with fellow passengers or on the phone. This isn't just me, other people have been really bothered by it too. For example, on the bus I was listening to a podcast on earphones at top volume but could not hear as a woman was talking to her friend right next to her at shouting volume. On the train it was impossible to hear announcements because a man was talking so loudly. Not just me, two other people had to ask him to talk more quietly so we could hear the normal volume announcements.
Right now I am waiting for the football to start. My windows are open. I definitely expect to hear shouts and cheers once the match starts but instead I am hearing 'chat' at full volume about various inconsequential things totally unrelated to football. People are SHOUTING their normal conversations. Why?