Most human behavior, despite our illusions to the contrary, is controlled by hardwiring in the brain. This hardwiring is the result of hundreds of thousands of years of evolutionary pressures that were fairly constant up until the last century or two. As a result, we're still behaving in ways that were highly adaptive until our clever inventions radically re-shaped our social environments.

All living things compete for resources and so competition-oriented behaviors are a fundamental part of any animal's repertoire. As such, women regard other women as potential competitors. That's why comfortable safe middle-class women attempt to eliminate competition from prostitutes (while dressing this up as a "moral" activity in order to ensure they can avoid facing up to the real implications of their actions). It's why American women denigrate "mail order brides." As this phenomenon is deep-seated and as we humans rarely even understand our true motivations, there's no strong probability of changing the situation through attempts to reason. As the ethnologist and neuroscientist Robert Sapolsky noted, "you can't reason a person out of a belief they didn't reason themselves into." So the best course of action is simply to ignore people who's "opinions" have no intellectual validity but are merely the expression of hardwired behaviors evolution has engendered.