So you're saying that it's shameful to have a small penis and it's OK to look down on people based on their penis size?

That's the assertion your theory is dependent on.

I know it's rare to think about things we say often but really try and think about it, it's a dumb thing to say and continuing it simply because it's commonly said would be really dumb - not everyone with a small penis is a rage filled monster but forcing these cruel assertions that someone with a small penis is likely to be the sort of loser that drives a Porsche does make it more likely someone with a small penis will fixate on it and suffer social anxiety because of it.