How many of you game only with "friends"? (As opposed to a fluid, casual gaming group)
For me the way you ask the question is a bit of a paradox.
See, I play with friends, with people I know and respect *prior* to the game precisely because the hobby of RPG is one that supposes sociability first. If I play with people I don't know, I will be on the defensive, weary of mistakes I could do, how I look, behave etc etc. At least more than with friends I know.
How many of you use some screening method for determining the players in your games? (As opposed to letting in anyone who wants to be in the game, or anyone who you are close to who wants to be in the game)
I screen people coming to my table just like I would screen people coming to a friday night party with me : I consider who gets along with whom, discuss with those who might bring some RL issues at the game table, and it all goes fine.
Am I wrong to choose not to game with a friend? Does it mean I really don't want that person's friendship?
Depends on the reason why you are refusing not to play with that friend. If that is because you are scared that your friendship will end, then that means that you probably do not believe you are friends in the first place (since, by my standards at least, being *friends* implies that you trust the other and feel like you are *yourself* with that person).
If that is for another reason, then I can't tell you. Some other reason might prove to be justified, like you are a really really sore loser, you have a bad comportment in games in general, you know it, and don't want your friend to suffer from this "dark side" of yours. Who knows ?
Let's just say it that way : if you don't have any other reason to ban friends from your game table than fear for your friendship with them, then don't - Trust your friends, and enjoy the game together.
Hope this helps, Wolf.
Odh