Wes has not learned that the sports facilities he uses are shared by all the people in the community. He treats the basketball court with little respect just as he does his own bedroom at home. Coach knows Wes doesn't think about his actions in regard to keeping the facilities in tip-top shape because he:

Changes into his practice sneakers before stepping onto the court
Puts away the floor mop after volunteering to sweep the floor
Leaves a trail of wet mud behind as he walks from the door onto the court
Reminds another player to wipe his feet as he is entering the gym