Yep, sounds like the guy's a true asshat. The only thing that will settle his ass down is someone to come right next to him and either:
a: Grab the 150's and knock out a few unassisted reps or
b: Grab the 140's and knock out even more unassisted sets
doing either one without so much as a groan.
Let me ask this, does he have the spotter hand him the weight too? Sounds like the kind of guy who would.