It is good that you have taken a stand against comments like this.
And for those that think such statements are acceptable because large numbers of {name whatever group} have acted in a certain way according to their life experience, then don't say anything when the next person complains about a demographic that affects you or your family.... the next "most black men," or "most black women," or "most Africans" or "most African American" comments.
There are a number of biracial individuals I have noticed in this forum and/or those who have admitted to having biracial friends, spouses, or family members! If this board is to uplift 'black people' then all those who consider themselves black and have an interest in helping out in the black struggle must be allowed to post their opinions without seeing such hateful comments directed at their demographic group (biracials) or have opinions automatically assumed about them. Nor should they be judged based on how another person who claimed biracial heritage has acted here, if such actions are considered against the agenda of the board! Otherwise the most accurate description would be biracials are not allowed simply because of being biracial!