Replying to My ski "buddies" suck

So I usually go up to the mountain (mammoth from LA since bear and high suck) with my best friend I've known for years who snowboards. However he sucks. Never wants to hit pow unless it has snowed 4 feet, always wants to lap the learner park when things are great elsewhere, takes beer breaks every other hour. I really enjoy hanging out with him off the hill, but he sucks on the hill. I wish it were as easy as finding a new crew but I don't make it up very often and he and I usually carpool. Do I split off from him and ski on my own part of the day and try and not be a dick about it? Do I suck it up and deal with his slowness even though I know it's stalling my progression? What you y'all think?