I want to kick a guy out of our friend group
That feels very rude. What is going on and why are you going to kick him out?
Everyone in the group still hangs out with him and I can't stand his existences in our gatherings.
You shouldn't kick people out of your group just because you don't like them. What if your friends feels differently and they kick you out instead?
He's kind of a shit to our group and I don't think he is helping us.
If you really feel like he's not good to your friend group then your other friends will agree with you and decide collectively to kick him out. However, I do not think that kicking him out is a nice thing to do, and sincerely talking about what he's doing wrong and helping him to change is the way to go.