So in conclusion is this "enough", are the sum total of many posts like this "enough"? Who cares, in the end people on the internet will yell about people being racist. You only need to decide "Is this someone whose beliefs I support and whom I want to give money to?" If the answer is no, you can tell other people why that's the case, avoid buying his books, avoid conferences he's being paid to speak at, etc. If the answer is yes then you can do the opposite.
For further actions, you may consider blocking this person and/or reporting abuse
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So in conclusion is this "enough", are the sum total of many posts like this "enough"? Who cares, in the end people on the internet will yell about people being racist. You only need to decide "Is this someone whose beliefs I support and whom I want to give money to?" If the answer is no, you can tell other people why that's the case, avoid buying his books, avoid conferences he's being paid to speak at, etc. If the answer is yes then you can do the opposite.