yeah...the skinny guy always want to prove that they are better than the big muscular guy....
I love when they do that LOL a week ago or so some 150 pound twink told me that i have a big gut and no abs so i must have weak gut

So i proposed to him to exchange punches in the stomach as hard as possible.He hit me first, i felt almost nothing it must have been all the fat that prevented me from pain

After i hit him guy bends in two and starts spitting some blood

Then repeated that, after the second punch he just started crying like a girl.Guy was a construction worker, thin but tall with some muscle. Dumb but true story

But both of us were fuking drunk

It was not my first experience with people who tried to"Proof"something even with some of my friends:))
Like someone here said, it's just the insecurity of skinny guys who try to bully a bigger guy.