I cant stand calling with low pocket pairs and I always fold them, with no fold equity and situations reversed its a good shoving hand but since I'm usually at best facing overcards and sometimes overpairs I'm usually coinflipping and I tend to avoid coinflips in non-desperate situations.
I think its a waste of time to think about his range it really doesnt matter theres no different to our winning equity if he's shoving 5% vs 70% you are still almost always up against overcards and overpairs.
As for this argument about shoving ranges you are both right. I agree with chenny that the shoving range SHOULD be wide and I also agree with you that it isn't wide, people don't shove as wide in this situation as they should.
I'm gonna give you my exact range in a second for this situation shoving on the button its pretty tight but this is a safe range against most blinds, if the blinds are really tight I open this up considerably:
22+, A3s+, A4o+, K8o+, K6s+, Q7s+, Q9o+, J7s+, J9o+,
T9o, T7s+,98o, 97s,87o, 86s, 76s, 65s