I agree with a lot of that. His clear use of Asian and African cultures as being those belonging to inherently evil men is abominable. The Dwarves are also obviously based on Jewish people which Tolkien himself noted, and their avarice is clearly inspired by stereotypes. I thought the movies handled the evil men with some sensitivity. They initially portrayed the Haradrim as being black and covered in leopard fur, but soon realised how offensive that would be and instead used wicker armour and had actors of different race in their ranks.

Although these examples are awful, I also think we are in danger of cherry picking. It's only fair to point out that all of the major named antagonists in LotR are white - The Sackville-Bagginses, Gollum, Saruman, Grima Wormtongue, Denethor and Sauron's true form. Something else worth considering is the storyline with the Druedain. They don't feature in the movies, but for those who don't know they are a culture clearly inspired by Amazonian tribes. The Anglo-Saxon Rohirrim are shown as disliking them for being ugly and hunting them for sport, and the book strongly condemns that behaviour. Aragorn later decrees that nobody else has any right to claim the Druedain's land as theirs but them, all of which I took as a reference to and criticism of colonialism but ymmv.

I disagree that Hobbits are never portrayed as bad. While the Shire itself is portrayed as an idyllic land, the Hobbits themselves are shown to be a judgmental and snobbish people and the reader is made to dislike them for their treatment of our two protagonists. Their naivety and refusal to become involved in foreign affairs is also portrayed as a negative and leads to the Scouring. There are also some troutty Elves - moreso in The Silmarillion but you could also make a case for the Elven King in the Hobbit, maybe - but I won't bore anyone by going into the minutiae of them. Orcs are definitely a lost cause though.

I also disagree with the intermingling of blood being portrayed as a negative and I've always seen Tolkien pushing it as a positive thing. The biggest victories for the forces of Good were shaped by unions between Elves and Men - Beren/Luthien as previously mentioned, Arwen/Aragorn that I am sure we all know, but (in my very nerdy opinion) most critically Elwing/Earendil, who some of you may know as Elrond's parents.

I suppose it's always difficult to judge figures of the past by today's standards given the progress that has been made over the past few decades. If you look at Tolkien's thoughts on matters of race in his correspondence he does denounce both Nazi Germany's anti-semitism and more notably for a white British man who was born there, Apartheid in South Africa. I'm therefore inclined to give him the benefit of the doubt and put it down to ignorance rather than maliciousness, but I also don't think some of the ideas he put forward have a place in the 21st Century. It would be no great loss to see some changes in this upcoming TV series, because I think the overall spirit of his work can still be retained even so.