I've never had a problem discussing freely. Some folks hate vehemently-tear it all down, kill them, what have you. Others are just uncomfortable with those 'outside' of what they find comfortable. Some harbor hate in their hearts-reminds me of Carter's lust.
I think most people just want to go about their business, living freely. I agree that their are folks that if they see a member of 'another race' they want to do 'something.' That to me is vehement and dangerous. Mostly those people are not ok in any aspect of living.