That's not how truth works. Something is true if it accurately reflects the state of the world. The statement 'that table has four legs' is true in virtue of the table's four leggedness. Just because you think a statement is true, doesn't mean it is, even if you have good reasons for thinking it's true. What you're talking about are beliefs. Consensus doesn't always lead to truth. Lot's of people believed in a geocentric universe for thousands of years. They were wrong. Just because a lot of people believe white males are discriminated against, doesn't make it true. To make a broad claim like 'white males are discriminated against', we'd need a large sample and lots of research. Unless the only point you're trying to make is that you (or some white males) are discriminated against, anecdotes don't do anything.
No, not unless someone measures it. We'd need to know exactly why these people voted the way they did and evaluate their claims. They might believe they are being discriminated against, but that doesn't mean their belief is true. Again, lots of people can be wrong.
It's weird, he's literally making the argument O'Brien makes in 1984:
O’Brien silenced him by a movement of his hand. ‘We control matter because we control the mind. Reality is inside the skull. You will learn by degrees, Winston. There is nothing that we could not do. Invisibility, levitation — anything. I could float off this floor like a soap bubble if I wish to. I do not wish to, because the Party does not wish it. You must get rid of those nineteenth-century ideas about the laws of Nature. We make the laws of Nature.