Lol, what is Scott's exact size? Below 4 feet? 5 feet? Anyway, sarcasm emoticon should be something like someone thats pretending to be surprised.
Just to be clear, pee-wee tennis in this context is in reference to the fact that Scooter often plays a couple times a week against players whose games are 2 levels below his. Occasionally he will have to skip tennis and/or social functions with his teammates because he's committed to playing such pee-wee tennis, at which point he usually starts getting razzed by his teammates who are, of course, only looking out for his best interests....
That said, it is nice that "pee-wee tennis" can have a double meaning here, also referring to that certain close-to-the-ground quality that he possesses