I wonder if they hate the noise at American concerts, signings, and such. The Korean videos show such quiet audiences, I'm sure it'd be hard to get used to all the noise--if they can hear themselves sing at all.
I doubt it it does get obnoxious sometimes but I think compared to how Koreans fans are I think it gets them pumped up they've even recognize that American or oversea concerts turn up and sing along xD to their songs versus Korean fan who just enjoy it
it'd be cool but there isn't really a point in them learning, they live in korea, they already have someone who speaks english so the others dont need to, its the same thing with Rapmonster and v know japanese and jin and jhope know chinese, if one or two of the members can speak a language, the others dont have to