Brotherly love

Q: I know two brothers who are constantly bickering. By way of insult one calls the other "Popsy", to which the brother will inevitably retort "Tank Top". Which insult do you think is worse, and is "Tank Top" really an overriding come-back for "Popsy"?

A: Using the DiPaco's sliding scale of insult impact, Popsy rates a 3.14. Tank Top rates a 2.93. However, when the scale is applied to the combination of the two insults, we get a 3.43.

So Popsy beats tank top as a stand alone insult, while Tank Top tops Popsy as a retort.

Note that the DiPaco sliding scale has no upper or lower limit.