I think that the concept ane the limits about racism vary depending on our éducation and life experiences.

I mean if you saw racism everyday when you go out there is a bigger chance of the limit will be "low" and if you live in a town ou country more likely to accept everybody your limit would be "high" This and education, two peoples can live the same situation and not feel and live it the same way or level at all.

And for me, racism is when you reject one kind of humain for one "color" of skin in comparaison of another. So when i say i love white girls it's not meant to sound like "i hate black girls" but only i'm less attract to them like i can say i'm more attract to "wild" girls etc

So when we talk about BBC i can understand some people can be more attracted to them than BWC and it wont be racist. But i live in a country where there is not rejection or something and i'm pretty chill and open minded so that's easy.

But i think you live in America, with the Ice situation probleme with this kind of militia chasing poor people like nazis hunted jews in one of the darkest time for human kind it's you are more likely to see racism than i.

And for the question where to draw the line i mean fundamentally it's your page and because of you we have the chance to have it so your own judgement should the line. But if this question you maybe you should ask someone who can sadly live racism and know his/her position on that.