Why do trucks always want to race cars?

Had the opposite happen to me while driving my 77 PU. For some reason a guy in a 80's Mustang came up on me and started goosing it. We were going slow enough for a drop into first gear. He couldn't hang with the 440. We hit traffic and he was killing himself trying to get back up next to me but never did.

Now that I could understand easier because he probably thought he was picking on something he could beat.
He probably traded that Mustang in the next day. :D