Blanche does not approve of Stanley for many different reasons. Stanley is a very violent person and is not very nice to both her and Stella. At one point Stella and Blanche are listening to music in their room while Stanley is playing poker with his friends. When Stella and Blanche put the music on Stanley flips out and runs into their room and hits Stella. When this happens he friends try to stop him, but he starts to fight them. This makes Blanche think that he is too violent for Stella. Another reason that Blanche does not approve is  because Stella used to live in a rich home and family, but now that she lives with Stanley this has all changed. Blanche does not like the place she is living in and how she is being treated. She feels that Stella can do much better than she is doing right now. These are a couple reasons why Blanche does not approve of Stanley with Stella.