I just listen very quietly or more like not at all....it's a thing I've done from a very young age and what my parents called... Very Selective Hearing ....:)D
Have some fun with it - like when they ask me something in a loud voice I'll say - what. Then when they repeat it even louder Ill say excuse me and if they repeat it again I'll quietly mumble - loud talkers say what - usually they say what. Cheers!
I find there are a lot of people today who speak too loudly and I attribute that in some cases to growing older and in other cases to everyone now using earbuds to listen to loud music. It's difficult to say anything mean so unless it was someone with whom I had to chat up, I would just walk away after a short time.