The way Maggie treats poor Albert, who is really only in the shop because of his interest in Alice, is shown through Alice's reprimand to Maggie after she has almost literally thrust him out of the shop. Alice says to Maggie:
Maggie, we know you're a pushing saleswoman, but...
Maggie, from the very opening of the play, has clearly forced Albert to spend more than he wanted and has been very short with him. Albert himself says that he had had no intention of spending a pound in the shop, but thanks to Maggie's forceful character and personality, he does. In addition, once he has agreed to spend that money, it is clear that Maggie gets rid of him very quickly. She makes no small talk, and bids Albert "good morning" whilst pointedly holding the door open for him to leave. When Alice reprimands her, Maggie only says that her treatment of Albert will "teach him to keep out of here a bit." Her actions towards Albert and the way that she speaks to him would therefore be verging on the point of open rudeness, as she forces him to buy what he doesn't want and gets rid of him very quickly afterwards.