Why does Blanche disapprove of Stanley

As Blanche puts it, "he's common." I'm not quite sure what she means by that but common means ordinary, like everything else. And as we know, Blanche only likes 'exquisite' men- men who are better than the commoners. She relates him to a an ape, saying he's bestial. Blanche then goes rants on about this hypothetical situation where he actually is an ape. And Stanley's poker nights; those are the gatherings of him and his kind. She disapproves of him because he's not anything like her kind. He's only common-folk, not high class like she is and how she believes Stella should be. She really shows her hatred for Stanley when she says that he's the kind of guy someone goes out with a few times only when the devil's in you.