Did becoming famous and educated protect Ambedkar from untouchability?
It did not, and that is one of the most important facts about him, because it disproves the idea that caste is really just poverty under another name. In 1917 he returned to India with degrees from New York and London and took up a senior post in the state of Baroda. He was, by any measure, an accomplished and well-placed man. He still could not find anyone who would rent him a room.
He ended up in a Parsi inn under a false name, and when he was found out he was driven from it. A prosperous, foreign-educated officer of the state was turned into the street for the accident of his birth. Untouchability, this episode shows, attached to who you were held to be, not to what you had achieved or earned — which is exactly why he insisted it was a ritual and legal position, not an economic one, and why money could not buy a way out of it.
This is the answer to anyone who imagines caste discrimination fades once a person is educated or successful. The most educated Indian of his generation carried it with him wherever he went, into rooms he was qualified to be in and refused entry to anyway. The disability he spent his life fighting was one he never personally escaped.