I've always found the real thing that people don't like, and I don't like, is the desire for approval. That childlike "look at me" thing that is endearing in a child but off-putting in an adult. I've seen it a few times among quite wealthy people, eg they try to impress you with how much wine they drink or how many cars they have, and it only works superficially. It's like a child somehow, and you often see them spouting their mundane thoughts in the media as if people want to hear what they think, or they start writing advice for other people to get rich.
The thing about socializing is you discover that if someone has one of these hangups (women, money, intelligence) everyone around them will let them demonstrate it. It's painful to watch sometimes. "Sure I'll try your car one more time". "Wow you're really smart".
By contrast I know genuinely megarich people who can't be identified as such, because they just don't have that need for approval.