High kicks are useless when you are in real close or grappling. I cant say what you should do cause I don't know what you know. If you want to beat him with your style then ask your teacher. If he can't help you around this problem he is not a good teacher. If you want to just beat on the guys ego a bit then get in close, use elbows and grapple as much as you can. Keep in mind the grappling IS NOT ground fighting and thats not what I'm saying to do. A huge double leg slam wouldn't be appropriate in a point sparring class that doesn't ground fight. Try using the throws, locks and short strikes from your own style. Close the gap and eat this kid up.

Of course it may not be the kicks at all, he just may be better than you in all respects in which case you should probably leave it alone.

If he's really rude tell your sifu you don't spar with people who aren't gentlemen and if he's a good teacher he'll know exactly how to handle that. If not, move on.