I'm not familiar with Tommy Sotomayor but like everyone else he is entitled to (his) opinion. Clearly many dark skinned women have found boyfriends and husbands therefore there is a "market" for them.
Awhile back I asked a question: Is there (really) a difference between having "preferences" and being "shallow"?
If a woman doesn't want to date men shorter than her, a man doesn't want to date an overweight woman, a person refuses to date someone with less formal education or income than them, someone who refuses to date outside of their race, or even someone who is only attracted to light skinned or dark skinned women/men...etc
It really shouldn't matter unless (you're) romantically interested in that individual. They're entitled to be attracted to whomever for whatever reasons. We all are entitled to have our own "shopping list" of traits when it comes to mate selection.
Thankfully we live on a planet with over 7 billion people. Odds are in our favor there are lots of people who are into whatever "type" of person we are.
Having said that I believe women internalize men's opinions about them as well as the images they see on magazine covers. Men on the other hand whether they be light skinned, dark skinned, fit, or fat don't give a damn about that kind of stuff. We don't necessarily rely on our looks to attract women. In fact many of us have been told if you're "successful" you can have any type of woman you want. In order for women to truly be "equal" to men they need be comfortable in their own skin to stop worrying about (some) men prefer. Happy/confident people attract others.
Women also have been known to be very competitive with one another. They love to watch the "red carpet" shows before the awards to praise or slam the gowns worn by other women. Whenever there is an opportunity they jump at the chance see what a celebrity looks like without her makeup. I was dating a black woman who told me; "I wish god gave me the power to destroy interracial relationships." I wondered why she would care who (other) folks date or marry?" Odds are she was never going to meet, let alone date those guys anyway. Oftentimes it's this "competitive spirit" for male attention that leads to dark skinned women hating light skinned women or white women. Men don't worry about their skin tone when pursuing dating opportunities. No matter what not everyone is going to desire you.