Offset is being sued over an alleged altercation at a dispensary ... with a security guard claiming the rapper attacked him. Jim Sanchez is suing the rapper ... saying he's a security guard who was working at MedMen LAX back in March when Offset and his friends allegedly came to the store. In the lawsuit, Sanchez claims he asked Offset to show identification which he says set off the rapper. Sanchez claims Offset "became hostile, verbally confrontational, and physically attacked Plaintiff by