I don't think this is true. Some of the most educated and wealthy people support the BJP, fascist though the party may be. Look at the vote split in the recent Delhi election. All upper caste voters flocked to the BJP by margins of 20%+. Dalits and Muslims voted AAP. Upper castes are disproportionately wealthy and educated.
My theory for this is that such people (relatives of mine included, sadly) are just higher on Maslow's heirarchy of needs. At the bottom you need roti-kapda-makaan (food, clothing, shelter), followed by bijli-sadak-paani (electricity, roads, water) and higher up health and education. If you've had all of this all your life, you take them for granted. When Modi comes along and peddles a grand vision to Make India Great Again, like it was in Vedic times, that captures the imagination and inspires us. When the BJP tells us that all of our problems are because of Muslims and that we need to put them in their place to fix everything, we're only too willing to listen.
This is pretty spot on. Something as simple and basic as the Maslow's hierarchy explains the voting pattern in India. It is no coincidence that rising middle class has coincided with the rise in BJP's electoral returns. With their basic needs met, their worry now is to protect their Gods, reconstructing a temple that was supposedly demolished 500 years ago and goddam cows! They really do not care about the plight of the less fortunate around them. Concepts like freedom of expression, individual liberty, equality etc. are of not much importance to them.
I agree with your statement. 7-8 years or so ago, right before first Modi election, I visited a friend. He is from very affluent, very well educated, in high bureaucratic positions IAS, IPS services. His mother was talking to me and asked who am I going to vote for. I kind of refrained from answering, and she said "Vote for the Hindu party". I honestly didn't know, how to respond without offending her beliefs. Obviously, this is anecdata...but combined with few more instanced like these you can somehow extrapolate that there are enough people who believe in this shit.