I am not sure he is using the tone argument, since he concludes with "but I agree that the author deserves some justice.". He may just be suggesting that many here at HN attack the author due to the racist tone of the post.
Pointing out an ugly tone does not mean you think it invalidates the argument.
I'm just saying as far as history has dictated, guys like MLK Jr. and Gandhi got a lot more support than those who tries to cut completely against the grain like Malcolm X in his earlier days.
As a minority, it is really, really hard to change or rectify the corruption of the majority by trying to fight them head-on. These sort of revolutions worked when the majority of the people overthrew a corrupt minority that had excessive power. However, thinking things over, I'm not sure if the author is even really out to solve the large racial issue in general with this post. I don't think that was his point, so maybe I'm offering suggestions to a goal that he never had in the first place. If this, like most tumblr posts, is just to get it out in writing so he can think clearly and draw attention by the public to the situation, then yes, it works.
Pointing out an ugly tone does not mean you think it invalidates the argument.