you have 2 options. You can first mute him. You do this by going to the going to playerlist while ingame at the main page menu of CS.
Secondly you can vote # to kick them, but your team has to do so. Example that status in console if his # is 111 get everyone on his team to vote #111 after a few votes he will be kicked. This will not solve your problem but will let him know you need him to be quiet.