Quote:
and its not really me to make fun of someone
Then here is what I would do. (it's hard to put into words as its mostly nonverbal but I'll try)
AMOG: "Hey looser, your mom just called and wanted me to tell you that she just washed your pink pyjamas that you pissed into tonight."
YOU: slooowly look at him, laugh maybe slightly exagerate the laughter as if he made a really a terrible joke but you didn't want him to feel bad about it. Like when a little kid makes a joke trying to impress you and that joke is not funny at all, but you don't want to disappoint the kid so you pretend to laugh.
Then slowly turn your head back and do what you have been doing before as if the joke didn't even enter your world.
If the joke wasn't really funny, you can do a completely exagerated laugh and then as if in the middle of the laughter stop laughing. You can literally do HA-HA-HA with small pauses between the HA's. It must not come off as if you were pissed by the joke. Just a flat Ha-ha.
Other option is to completely ignore it. As if you didn't even hear it and keep busy with whatever it was you were doing. Your world doesn't even involve them! They don't exist in it!
Or say "Cool man" not even looking at them. And keep on doing what you were doing. (If you didn't do anything then you should have! You should always be doing something at least to look like you do. I for instance pretend to be writting an important text msg, if there is really nothing else I can be doing)