What? Bringing beer/wine/snacks to parties is just polite.

There are degrees.

Bringing a reasonably priced bottle of wine from a winery you like - nice and thoughtful. Bringing a bottle of Opus One - you're overcompensating.

There is a difference between choosing to do something like that because it is polite (or whatever other reason you find compelling) and feeling like you have to do it to be acceptable.

If there's a difference, it's only in degree.

Needing to bring something special to any sort of event, bringing too many things - just in case.

It's overcompensating for years of not feeling like you are welcome, and years of only being acknowledged when you had a desirable item or knowledge, otherwise you were a person non grata.

"In order to be loved, I must be me, plus something else."

Like if you're hosting a party, it's easy to obsess about there being enough entertainment, food, booze, etc, far beyond what's actually needed.