I didn't have a date or anything, so I and this friend of mine, Mal Brossard, that was on the wrestling team, decided we'd take a bus into Agerstown and have a hamburger and maybe see a lousy movie. Neither of us felt like sitting around on our ass all night. I asked Mal if he minded if Ackley came along with us. The reason I asked was because Ackley never did anything on Saturday night, except stay in his room and squeeze his pimples or something.
What does this passage reveal about Holden's perception of Ackley?