I think it was a set up for Bobby’s line later, “I see things clearly now. I’m going to grow up without anyone to love, and die friendless and alone like Weird Al Yankovic.”
But Hank wants to make it unattractive to Bobby. Hank doesn’t want Bobby to be a comedian and keeps trying to talk him out of it. And Hank is willing to make blatantly false statements to Bobby to get him to do what he wants, like “Soccer was invented by European ladies to keep them busy while their husbands did the cooking.” It’s a recurring theme throughout the series.