How to deal with A Egotistical, cocky player?

Some context: I’ve been playing basketball for about 5 years now, and I’d say I’m pretty good, ï consistently score on former pros, college players, and anybody in between.

Now for the first time in 5 years, I’ve met somebody who is just absolutely so full of themselves that it genuinely pisses me off. Basically this guy randomly messages me saying cocky things like “Your ass, I could beat in in 6th grade” or “Your so bad I could beat you with one arm behind my back. And he likes to flex the fact he gets “offers” which I honestly doubt all he ever shows is a envelope from a college not actually anything it says. Whenever he texts me he says everything he can to try to “prove” to me that he would beat me, however I just tell him it would never happen, then he keeps rambling about how he would and the cycle continues. All of this being said, what would you guys recommend?