He was racist in his early life. He was born in second half of 19th century and went through education system designed by Brits.

But his views changed after he witnessed the Zulu uprising. Not immediately but they did.

One thing you have to remember is even after he returned to India, he still believed that the Empire (and the West by extension) were leading the human civilizations and their progress. He and many other Indian leaders were demanding home rule (the country would still be part of the British empire). The catalyst from home rule to complete independence was the Jallianwala Bagh massacre.

So yeah, it took him a long time to reject the notion of white superiority.

As for his experiments about sexuality, he was deeply flawed. He didn’t have sex with anyone, including his own wife, when he started his experiments with celibacy.

As you may know he got married when he was 13. When he was 16, his father died when Gandhi was with his wife and the same year the couple had a child that lived only for few days. It’s not hard to see how this could’ve contributed to his views about sex and abstinence.

What he needed was a therapist to work on this feelings, if you ask me.