I'll try again.
You said that this abuse couldn't be racist because despite the fact that both diseases disproportionately affect black Africans because they could be caught by anyone.
The fact that the disease could be caught by anyone was your golden bullet.
If you believe that to be true...
You said "Pretty sure anyone can get either disease so therefore cannot be racist."
By the same rationale, anyone could be a slave so it is perfectly fair game to use slavery to abuse black people.
Good to see looney has moved this one on to - 'Is racism really THAT bad' and 'It's ok to be racist if you have been annoyed by a football match or are pissed'