As the GM I try to immerse my players in the world of Warhammer Fantasy. I also encourage the players to write well thought-out backgrounds for their characters. However, there is one player that has some difficulty with this.
The player in question plays a 220 year old female Wood Elf mystic (the player is male IRL) from the Laurelorn Forest that travel because of a curiosity of the world outside of her home forest. This is not his problem, though. His problem is matching his acting with his background. Or rather, he does not act like a Wood Elf convincingly. When he act he sometimes giggle and is not very secretive about his character to other players and NPCs that you would expect a Wood Elf to be. He also seem somewhat oblivious to this.
I've tried teaching him about Wood Elves by looking trough the their armybook in WFB, but I have avoided being too harsh so as not to come across as dictating how he should roleplay.
What I'm asking for is your thoughts and suggestions on how to handle this.