Take them out for lunch, talk to them and try to understand why they are the way they are. You said they are doing an above average job, what more could you ask

Take them out for lunch, talk to them and try to understand why they are the way they are. You said they are doing an above average job, what more could you ask for. It could be because they are new they are just trying to make there mark but going the wrong way about it. You could fire them and hire someone else you get along with but what if this person needs help doing even the simplest tasks. You dont want to spend the day wiping there arse. You would soon be wanting the other guy back even though they annoy you slightly.