My contention is that if we are not making a conscious effort to better ourselves, to be pleasant, funny, and filled with joy and good will, the opposite happens as a result of the indignities of the aging process.
So, Lou is just one of the hundreds of millions of old timers, who have not worked at maintaining his attitude, and has succumbed to being a human black cloud. I just ignore those types and don't engage them. They can keep their ranting, misery and lack of understanding of life's basic principals to themselves.