I understand the struggle. After much thought, I have still decided to read/watch/attend anything HP that I want to.
In this particular case, “Harry Potter” – and all it represents – feels much bigger than its creator. While I don’t support or agree with Rowling, I don’t see her closed mind represented in her art. In fact, her art often promotes love, acceptance, understanding, etc. Harry Potter has (and continues to) make children excited about books (and perhaps the play is making children excited about theatre) and I think the good that has come out of the Harry Potter stories outweighs the bigotry of one woman.
And, in terms of supporting her financially, she is at a level that she is so rich it wouldn’t matter if she didn’t make one more cent in her life. However, the entire Harry Potter brand is giving jobs to (at least) thousands of people between “Cursed Child,” the theme parks, the movies, the stores, etc.
I also found Daniel Radcliffe’s statement about JK Rowling/Harry Potter very insightful: https://www.thetrevorproject.org/blog/daniel-radcliffe-responds-to-j-k-rowlings-tweets-on-gender-identity/
I draw my line when the art itself is promoting some form of hate/negativity, when consuming some sort of art/product has a significant impact on the person or business’ success, or when it’s something like MJ the Musical – where the show is celebrating the person-in-question.