I have a friend that won't stop pestering me to play tf2, I don't want to be mean to him but when I want to play another game like gmod with another friend I would be in offline mode. Because I would be in offline mode I can't join his server on gmod. Is there any way that I can appear offline but not actually be offline , as in I can still see my friends online but can't see me online?
You have to click on Friends button and select Offline. It will show you as offline in friends list, but you will still be online on steam. You won't be able to see your friend list, but you can still play with them if you join through other means (web profile or game browser within the game).