Maybe, but this was just a very contrived unrealistic example to make the numbers very easy and error of calling super-obvious, just my opinion but I think this situation comes up all the time.

You & ISF correctly pointed out that this isn't a call for the correct resons but that doesn't mean I don't make 20 them every day, maybe most people already see this though.

I just doubt most people only call flop bets with a medium pocket pair when they are a favourite vs. an aggressive villains range or because they are drawing to a set but rather it's because even though they are a slight underdog the pot odds are in their favour so folding would be a 'mistake', and when they face that inevitable turn bet they will look at their equity again and go mmm. 40% equity vs. his range & only need 30% to make the call, EZ game baby.

Anyways it was a eye big opener for me - the negative cumalitive effect of calling bets even as only a slight underdog.