The exact opposite is true in some places: being a massive asshole is often rewarded because those people are able to bully others into getting what the assholes want done. Only it's dubbed "influencing". The higher up you go the more toxic and defensive the political landscape.

I have massive empirical evidence against your statement.

Depends on the company. In most companies, you MUST be an asshole to get promoted.

Popularity with the persons in charge of promotions surely helps... But it doesn't mean you need to be popular with other people.

If you are at a place where that’s true, cherish it. It won’t always be true.