[Melinda]

Maybe because she acted like a tramp for the times she lived in. Real ladies of her day had no respect for her or other pin-ups like her.

[visualops]

Perhaps, maybe they were just jealous of the attention. Many famous actresses at that time and in previous eras did what could be considered "pinup" type work, Jean Harlow, Rita Hayworth, Betty Grable, Jane Russell, among others.
I would imagine any person of breeding would have actually considered a career as a dancer or actress to be low class. Unless one became rich I suppose lol