This is taking the unfortunate/entitled/nice/beta/shibboleth-of-your-choice males' complaint too far at face value - i.e., that they are sexually unsuccessful on account of being kind and prosocial.

I used to believe this, but after doing some research, and further experience, I changed my mind.

First, the available research doesn't show a disadvantage of altruism, agreeableness, and prosocial tendencies for men.

I used to experience agreeableness and altruism as disadvantages. Now I experience agreeableness as sometimes a big advantage, and sometimes a moderate disadvantage. Altruism is neutral, as long as I can suppress it to normal population levels (I have excessive altruistic tendencies).

Hypotheses that reconcile this data and anecdata:

• Prosocial tendencies are orthogonal to attractiveness
• Prosocial tendencies have a non-linear relationships to attractiveness (e.g. it's good to be average, or maybe even a bit above average, but any higher or lower is a disadvantage
• The relationship between prosocial tendencies and attractiveness is moderated by another variable. For instance, perhaps prosocial tendencies are an advantage for extraverted men, but a disadvantage for introverts

What's creepy about this group is precisely the entitled attitude on display - that they deserve to enjoy sexual relations with those on whom they crush merely for being around them and not actively offending, or indeed in some cases for doing what in other contexts would be rightly considered kind and prosocial.

While some people who believe they are sexually unsuccessful on account of being kind and prosocial have this attitude of entitlement, ascribing an entitlement mentality to that entire class of people is a hasty generalization. It is likely that people who believe they are sexually unsuccessful on account of being kind and prosocial with a genuine entitlement attitude are very visible (far more visible than people in that class without that attitude), and this visibility may distort estimates of their prevalence due to the availability heuristic.

Furthermore, in this context perhaps you would agree that "entitlement" is political buzzword that has not been appropriately operationalized. In some hands, it is used as expansively and unrigorously as "nice" and "jerk."