It looks like the one mandolin player lady sitting there is disgusted, just feels like smashing her mando. All those years studying and practicing, upstaged by this. Sometimes life just doesn't seem fair.
I see this all the time, find some gimmick instrument and make a career out of it, start busking, all the tourists throw money at you. The thumb piano springs to mind (excuse the pun), you can't even play a wrong note.
The funniest think I see here is Asian migrants busking playing the didgeridoo, putting the aboriginal players out of work even though their ancestors have been playing for 10's of 1000's of years. Actually it's not funny