TJ's hairline is so far back, his friends don't even want to talk to him.
Receding Hairline Problems
Explanation
Explain Bear
Listen up, genius. You think it's funny when someone's hairline recedes so far back that even their pals are distancing themselves? It's an exaggeration, see? The joke implies that the hairline is so bad, it's causing social isolation, kinda like you at parties because you tell jokes like this.