Men who are secure in their masculinity are both great lovers and don’t waste their time trying to make themselves feel like real men by putting down women on the internet. It is well known, and has been scientifically shown*, that men who spend large amounts of times posting about women’s genetic and nature-born inferiority have tiny penises and are trying to compensate for being lousy in bed.
Now, whether that’s true or not, such a statement may cause these loser-“men” to subconsciously doubt their virility and indeed perform poorly in bed (even worse than they already are!).
Stereotype threat occurs when people are aware or are made aware of a stereotype regarding their group. When presented with this stereotype, their measured performance moves closer to the perceived mean for their group. This effect has been shown over and over, for minorities, for women, for lower-caste Indians in India, in testing situations and in real situations. It is a real phenomenon. You tell someone that their group is bad at something or worse at something than another group, and their performance will suffer. These negative stereotypes become self-fulfilling prophecies.
Stereotype threat is malicious and malignant. When men post bogus studies about women and minorities’ supposed natural-born inferiority and complain about poor Larry Summers (who, incidentally, was pushed out of Harvard for problems with micromanagement, his abrasive administrative style, and his general disdain for any humanity/social science field that is not economics, and not for anything to do with his ignorant remarks at NBER), they are feeding stereotype threat. On Chronicle forums, they are making academic women feel like they should and can achieve less. On gifted forums, they’re implicitly encouraging housewives to stay home with their children, and to not expect as much from their daughters as from their sons. Their unchecked general acceptance that people who aren’t white (or occasionally Asian) men are inferior can spread to other people who read their comments and “proofs” who then spread the contagion to people IRL. And such comments push out those who would argue against them by creating and promoting an unwelcoming and hostile environment for women who aren’t willing to be bullied.
Why so Slow by Virginia Valian is a must read. It’s a fantastic literature review and well-reasoned argument of exactly how many of these differences that some ascribe to genetics are actually the product of our culture. If you are a nature-only person, this book provides convincing evidence of nurture.
by Virginia Valian
Even if there are strong genetic differences in ability or whatever by gender (which there probably aren’t), that does not say much about individual people. Imagine two normal curves overlapping normal curves, in which one is slightly shifted:

Now compare the area under the curve that is shared to the area that is not. Individual differences will always outweigh differences between groups. Or if you believe Pinker (and many experts do not agree with his conclusions or his methods), the two groups may have the same means, but one curve is fatter and the other taller. Almost nobody is in the parts of the tail that aren’t shared. Again, individual differences are always greater than differences between groups.
So, to summarize, if you have a tiny penis stop being an ass on the internet. If you have to harm people by telling them that their entire group is inferior, you’re doing real harm and you’re a loser. Real men don’t need to put women down in order to feel masculine, because they already are.
*using small-penis-man definitions of “scientifically,” not standard definitions from people who understand statistics, though no doubt there is actually a correlation. Someone should study that.
Disclaimer: Penis length is not a direct indicator of female satisfaction, nor does it actually have any bearing on a person’s value as a person. However, we choose this example because we believe it to be most insulting to men who constantly post negative “proof” of women’s innate inferiority (which is stupid of them). Additionally, it is well known that ability in bed increases with one’s valuation of one’s partner ;).