What are politicians griping about. Are the rich expected to do poorly in a good economy?

Unemployment is at the lowest level in my lifetime.
Economic growth is at a level that some experts thought was unattainable.
Plus, according to th NYT, there is little threat of inflation. Hourly wages are up over 3%

But in spite of this nice news, politicians gripe that this economic boom cycle only benefits the rich.

But the Rich ALWAYS do pretty well.

Duh.

Do they expect the rich to do poorly?