IRL I'm not the type who instantly friends everyone. When I meet a new guy (for example, my friend's classmate), we introduce to each other and shake hands. For the next week, I observe his behavior closely while trying to avoid interactions with him (Don't want to make any friendships I might regret in the future). If he's fine for the entire week, I'll consider hanging out with him. But if he seems like a troublemaker, I reject all kinds of interactions and avoid him.
I'm absolutely terrible at making friends and I don't really go out of my way to make new friends. However, as long as there is a common interest I can sustain a conversation with them. If I spend enough time with them, they eventually turn from acquaintances to friends.
