I don't think I'm going to give my carpoolers a cheaper price.
Why not give them cheaper prices?
Because they annoy me a lot and I hate to drive in traffic with them.
You shouldn't take advantage of good people like that. You should give them a cheaper price if that's what they deserve.
Maybe if I disrespect them then they'll stop being so annoying.
I think it would be better for you to talk to them and explain how their behavior is affecting you. You may offend them a little bit, but that's preferable to taking advantage of them or disrespecting them. And if you talk to them about their behavior, they can make improvements.