According to Urban Dictionary, a "simp" is defined as "a man that puts himself in a subservient/submissive position under women in the hopes of winning them over, without the female bringing anything to the table." There are many other definitions for a "simp," but basically it's shaming men who are kind to women without getting anything in return.

Let's just stop attacking nice men. Work out your own issues, don't project your shortcomings onto another man. What happened to the brotherhood? Y'all can lie for each other, but can't raise each other up? You guys can encourage murder, gang rape, and violence against women — or at least stay silent about it — but can't let your brother know it ain't cool when they bring you down for being nice to women with no expectation?