It isn't "no reason"...dude buys a ticket, is forced to sit in the flight attendant jump seat, then further forced to sit IN the bathroom. I don't know about you but that would have me raging mad.
exept he probbably bitch so much that they tried to accomodate him out oof there own good will. then when the flight attendant felt uncomfortable (probbably sick) they asked him to chill in the toillet.