Now watch this:

Step 1.- Debbie gets the scent of someone he assumes is younger and confused and needs guidance.

Step 2.- Debbie slithers in offering advice on how to toughen up like him, which means lobbing insults on the internet. The role of obese guru is now activated.

Step 3.- When Debbie fails to persuade him to be receptive to his Dr. Phil larp, and it becomes clear that anon has no interest-

Step 4.- Debbie will troll him mercilessly, picking him apart in endless assumptions, expecting anon to divulge personal information to deny baseless accusations, which he then uses to further attack until the poster leaves, or alternatively, rages for years swiftly escalating to telling anon to kill himself while Debbie maintains certainty of his moral superiority.

All this because a meeker, more socially adjusted anon rejected his advice and, by association, interest in him.