There's this kid at my school who has been trying to shove himself into my friend group recently. He's sitting at our table and taking our food from our lunches when he never asks and butting into conversations and trying to come up with ways to spark up a conversation with us.

The thing is, I know that he has mental issues so I don't want to do what I usually do (which is be a blunt ass bitch), but I know that my friends are bothered by him as well as one of them complained about him bugging her in the library. He's also trying to use the excuse that I've known him since 5th grade (even though i haven't said a word to him since), but I just wanna be aquaintances. So do you guys know of a way to subtly and gently shove him back a few feet?