Lad, congrats on standing up for yourself. frankly it sounds like this idiot uses his money because he's too pathetic to go and better ways of relating to people, so he just bludgions people into what he wants, ---- eg, instead of admitting that he knows less than you about hydrogen bonding, he tells you to shut up. Sadly, I've met a fair few people like that, indeed I remember once telling a Marquis "tough luck" when he was attempting to get me to bend certain rules in connection with my department on his behalf simply because of his title.
Another thing to remember, is that if he's really got! that much money, he's not really giving you anything, since it's no inconvenience to him, after all a hundred pounds from a multimillionaire means nothing, but the same amount from someone earning 20 k a year is very different, since they've sacrificed a good amount of what they have.
I actually had to think this one out myself since one friend of mine earns about eighty thousand pounds a year, as well as having a whacking inheritance, (that's about 130 usd). Whenever we get together for a drink, I'll provide coffee, --- good coffee made by me for about seven pounds fifty, while my friend will turn up with a sixty quid bottle of wisky to go with it.
I felt really guilty about this, since to me something that expensive, if I have it at all is not something to be drunk just when we get together. Then however I realized that to him, that wisky was the same approximate price as £7.50 of decent coffee is to me.
If we go out anyywhere and share a taxi, we do just that, split the price, ditto if we see a film, indeed I usually use my disability discount to get my friend a free tickit.
So, i'd question weather this wealthy idiot was really giving you anything at all, ---- not if he was giving no actual friendship, making really nasty and hurtful jokes at your expense and behaviour like a total git.
good riddence to him