@Ghanagirl - firstly as other posters have said, MN is a microcosm of society, so unfortunately there will be racism here - MN is not a Utopia, free of nastiness - though I firmly beli be that it is, on balance a good place, and the good things that go on here vastly outweigh the bad.
I also believe MNHQ will deal firmly with any racist posts that are report d to them - just as they deal with personal attacks etc. But we, as members of the community, have a responsibility to do our bit by reporting any posts we feel cross the line. We aren’t just passive observers of the site - what we do here helps to shape MN.
I also think that the anonymity of MN can be a good thing - I tend to feel that people who meet me will judge me very negatively because of my weight, and find it comforting that, on here, I am judged on my thoughts and words as expressed here. I am honest with what I say, so I hope I give an accurate representation of who I am - and I assume that the rest of MN are the same.
When one is particularly sensitive to a particular topic, every single mention of it tends to stick out like a sore thumb, and we tend to notice the things that reinforce our beliefs (I think this is called confirmation bias) - so I am particularly sensitive to things that denigrate people like me who are fat or have depression or anxiety, whilst others are really sensitive to any negative mentions of mothers in law, or formula feeding or gender critical views - so they will ‘see’ these things as a much bigger problem on MN than they actually are. You are clearly far more finely attuned to anything with racist overtones, because of your life experiences - so every time you see racism on here it will really stick in your mind the way other things stick in others’ minds.
I am not saying that it is not a problem - as I say, you are more attuned to this than me, and I believe you when you say it is here - but I also believe that MNHQ will do whatever they can to deal with it, when it is reported to them, and I also think that most MNers will challenge it when they see it - that would be my hope, certainly.