Why does Mrs Higgins not want her son around visitors in Pygmalion Act III by George Bernard Shaw?

In Act III of George Bernard Shaw's "Pygmalion," Mrs. Higgins expresses her concern about her son, Henry, being around visitors because she believes he is likely to behave poorly and offend them with his bluntness and lack of social decorum. She is worried that his eccentric personality and unrefined manners will embarrass her and disrupt the social gathering. Her desire to maintain a certain level of civility and respectability in her home drives her insistence that Henry should not mingle with their guests.