If I want to meet up with somebody ingame, i just tell them to get on TS even when I don't know them, I've never been backstabbed this way, since we put so much effort in just meeting up both ingame and outside of game, communicating and stuff, that it's not even worth shooting anymore.
I know you didn't, I was just pointing out that it's hilarious when you read that in chat, eventhough it happens all the time, still gets me every single time.