I don't think they are demonized necessarily, They are a silent majority perhaps frowned upon. According to many demographic sources singles are "45 percent of all U.S. residents 18 and older". That is 107 million adults. I just don't see that much wickedness.
Sixty-three percent of that group has never been married, although they do or may have cohabitated as a couple. Interestingly 27% live alone, so does that mean only those are truly single? If that is the case perhaps prejudice may be more readily seen especially socially-economically more so economically. They are a smaller marketplace therefore less profitable. That is easily seen how food stuffs are marketed through packaging and housing. Housing is kinda' out of control to begin with especially for a single person. Another prejudice factor 'may be' consideration for job promotions and some cases pay raises. The single person is thought not to have the same obligations as a married person.
Divorce rate is an illusive number. A demographic points out "In 1997, 9.8% of the adult population was 'currently' divorced". Also, you have to read the fine print how the rate is determined. There are different methodologies.
Source: U.S. Divorce Rates and Statistics @ Divorcesource.com / http://www.divorcesource.com/ds/main/u-s-divorce-r...