well, yeah
he's trying to cash in on what the people with skill and planning are performing
and he's getting up in everyone's faces and trying to be the centre of it all
it's obnoxious
As a musician, I can tell you that they indeed most likely took jazz ensemble and know their **** , because jazz solos are nothing more than listening to a beat and coming up with your own **** .
As a music theorist, yes they are strangers. The dissonance in some parts was not because of a lack of knowledge of a piece or anything, it was the lack of rehearsal. This was an impromptu sax-off. Very impressive alto player. Very patient.