I agree with a lot of what you said here, but this is one of those tropes that just doesn't hold water. Boys who are raised by single mothers are not inherently more "feminine" in any material way, they are not more likely to be wimps, mama's boys, or gay.
"In her new book, Raising Boys Without Men: How Maverick Moms Are Creating the Next Generation of Exceptional Men (Rodale Books), Drexler demonstrates through nearly a decade of research that boys who are raised in single-mother homes are just as likely to develop into happy, healthy adults as boys raised in households with both a mother and a father.
The idea that boys acquire masculinity only with an in-house male in the mother’s bedroom has prevailed to the detriment of both mothers and sons."
