For me this is a tough situation to evaluate. I don't mean to bore anyone with details but I feel by going indepth on the scenario will enable anyone who took the time to read could offer me more accurate advice as well as hopefully lower the amount of times I will need to repost or repeat messages. So here we go...
I've known the player for approximately ten years and we've been gaming together for about eight of them. He's a reliable player in the aspect of he always shows up for game and never leaves until the DM calls it a night. He does not own any of the pathfinder books or have internet access at his home so I do try and cut him some slack for not being 100% on all the rules. (Well, I paused here for a good thirty minutes trying to think of something else he contributes to the game/group and could not.)So lets get to negative attributes....
First as the DM, it's a priority of mine that I not have any out of character tension between my players. The one player is disgusted with Drake's(The problem player)Roleplay and quite frankly I have to agree. An example is one of my players will be talking to a quest giving NPC, when out of nowhere Drake starts talking as if he was there. He constantly interrupts conversations to add his meaningless two copper.He's always trying to change his actions or declare his statements were him talking out of character. My other player is more or less disappointed with Drake since he's isn't a team player. After combat Drake expects to be healed and throws a hissy fit if our paladin chooses not to. "You're suppose to be Good" is the typical response. Where I intervine and say "Well atleast he's not being evil" Most of the issues I have with Drake involve his lack of knowledge. Even with a fully written character sheet, I still find myself, every game, doing the math to make sure everything is by the book. The horrible part is I know he's not the smartest person in the world but, he doesn't show any incentive to change his ways. I don't know how many times I've told him Ranged attacks provoke attacks of opportunity within an enemy's melee reach.
Now I know most of you would tell me just to find someone else and its not that it would be difficult for me to do such. It's more of a matter of feeling guilty for removing the only social life this player has outside of the bar. The only thing I can think of doing is rewarding XP at the end of the session for answering game related questions in hopes he'll pay more attention to this day he hasn't answered a single one.