Sometimes the best approach when dealing with a selfish person is to move along and disengage. Gordon B Hinckley said “happy is the man who can brush aside the offending remarks of another and go on his way.” Keep moving. That’s the best approach to someone who has no clue as to how they are affecting you, using you, or dominating your space. My great-grandmother used to tell me “if they are rude enough to suffocate you, don’t feel bad correcting them.”