Ping.
How anyone can imagine him racist is an indication that that individual hasn't read him very closely - the punchline to Starship Troopers was, after all, that its protagonist wasn't white. Farnham's Freehold is a brutally revealing read for anyone captured by contemporary progressive illusions, and it challenges their conviction of who is on the "right side" of history because that's exactly what it was intended to do. If you're shocked, you just might be part of the problem.
I won't expand on his late-life peculiarities in sexual matters because they really aren't all that significant to his body of work. At most, a distraction. How he felt about human freedom, though, is far more pertinent, IMHO, and The Moon Is A Harsh Mistress is a work that only improves with age. And then there is one, a juvenile novel of my childhood, Podkayne Of Mars, whose original ending was never published in his lifetime due to its intensity. You can find it in the posthumous Grumbles From The Grave. I think that the editor was mistaken, the book is far, far better with it even if it makes the kiddies cry. Highly recommended.