Well, noone can stop you. But as Mmario indicates, you'd probably get some adverse comment. Racism isn't too popular, I suspect and hope, among Mudcatters.

However I assume that was just an imaginary example picked out at random, rather than a genuine one. The underlying principle I think is that what is best to do is primarily

to use the Mudcat to find out information about your particular interests,

to share your enthusiasms and your discoveries,

and also (I would say, but some would disagree) to discuss and explore various other topics of interest with people with whom you are united by a shared interest in folk music, which can transcend disagreements about some other things.