I don't think this might result in any difference of rating this forum.
It is already misogynist if there are comments about AW are not good marriage material and the US-male should look abroad for a suitable wife/girlfriend - this brings already radical feminists into action, calling this forum a place about how to find an Asian doormat, a site for mail-order-brides sold by her parents who are full of drugs and sold her helpless daughter to an wife beater and similar BS etc.
Cornfed's few comments about black people will not change anything about the reputation of this forum.
Some comments from him are truly racist (ALL black people are animals etc.) and make no sense at all, some other content is fairly true but exaggerated, similar to comments from Mercury.
Some other comments from Cornfed have the only problem, that they are not politically correct by US-standards (2 % of young black people commit 50 percent of all crimes in USA) but I firmly think, he should be allowed to post them.
However which threads of Cornfed are 'violence promoting'?
BTW, easy access for trolls, sockpuppets, spammers etc. is also a reason to rate a site lower ....
and also unsecure internet connection...
You might shut out any visitor, who is NOT registered, if you disable the guest option to prevent any not-registered person to read this forum...
Insist during sign-up that all new members have to register and to post a first comment into the 'Introduce yourself' section etc.
But otherwise Not much what you can do about, except you change the entire forum into a religious web-page - there is a guy who did that...Rooshv - a forum for Christian men... but I hope, you have no intention to do that...