I'm not op, but will tell two stories that may interest you.
My cousin, mid 30's has FU money. Took him around 8-9 years of hard work (not in technology). He's the guy that buys a 5k rolex (or whatever big brand of watches) for fun. Last 'toy' he got was a 250k euro car for himself to drive maybe 1 month a year (he travels a lot). He is still an amazing person, tries to help people. He will have no problem spending a day with you trying to help fix a problem you may have. He will lend you 5k, no questions asked.
My parents try to badmouth him every time they can, and try to bring his accomplishments down at every party/gathering. From insulting his business partner to just saying he is an exploiter of people/resources/whatnot.
I noticed his friends, behind his back do the same, even though he throws parties for them, welcomes them in their house, lets them use his pool even when he isn't there. The car I just mention before, he lets anyone drive it if they ask. But still, the envy is there.
On a smaller scale, my wife's family and friends. My wife decided to quit her job to raise our kid. I still work, but due a good amount of effort, I'm making a good amount of money. There is no need for my wife to work so we both prefer that she stays with our kid. We also live a decent life (near the beach, pool, etc) but not FU money like my cousin. The amount of flak she gets for our choices is just amazing. From her mother telling her she is kinda useless, to her friends making snide comments about getting a 'rich husband', etc. We never show off, we invite everyone to spend some time with us for free in the summer (saving them 1000's in holiday rentals and food), but still, I can feel the jealousy in them... Hard to explain completely.
I never thought this, but last few years what I noticed is in general, people are an envious bunch. A few are really happy for your successes, but most will resent you, because you are doing better than them, or 'showing' to them that some of the decisions they made in the past were the wrong ones, and they can't really come to terms with it, so it is just easier to excuse/criticise you.