For me it was 50/50. 50% it was a joke. 50% the guy was "one of those a-holes". They exist so it's hard to tell.
They aren't always American as some other commenters have pointed out. Was on a tour bus from Paris to Giverny and some Italian guy thought it was okay to watch his sport events out loud the entire way. Had a similar experience on a long distance train in Germany and another in a train in Japan (western person, not American). It's crazy to me people don't get how annoying it is. I'm sure they'd be annoying if I pulled out something louder but it apparently never occurs to them.
They aren't always American as some other commenters have pointed out. Was on a tour bus from Paris to Giverny and some Italian guy thought it was okay to watch his sport events out loud the entire way. Had a similar experience on a long distance train in Germany and another in a train in Japan (western person, not American). It's crazy to me people don't get how annoying it is. I'm sure they'd be annoying if I pulled out something louder but it apparently never occurs to them.