They won't change and they get minimal if any time on the schedule. That's how I handle it. 

"Keep your face always toward the sunshine, and shadows will fall behind you." — Walt Whitman

Know what’s coming and let it slide. 

Sometimes you just have to disassociate. 

The old adage - is the glass half full or half empty?

I am of the same cloth except the rudely interrupt part - but perhaps i am rude at times. 

Life is Short and Life is Precious!

Here Comes the Sun!!!

Great song!

If I have a choice, I choose not to be around that person. 

If I don't have a choice, I try to let it flow and respond as little as possible (I've never done any martial arts, but I like to think of it as a "be like a willow in the wind" concept where you let the opponent's own momentum work against them). The other person may or may not understand why I'm doing that, they may even think I'm not listening or I'm rude, but they do know that the conversation isn't going anywhere so hopefully they change course or walk away. :)  

Rude is an approach :)

I confess. I am guilty of the negativity emphasis. I know we do not talk about politics in Gotham,and perhaps I don’t try hard enough, but my formerly very positive outlook is being smothered by the words and actions of the clown in charge who is destroying our country.

We’ve discussed & generally that those kinds of entities get excised or purged to the extent practicable from all phases of my life. I argue for positive reinforcement & intervention only where threat of injury — especially to others — appears likely 

My family tells me things have to even out, and that you have to take the good with the bad.  I always respond, "Where is that written?  Why can't I just take the good and not the bad?"

“It takes two to Tao.”
― Ana Claudia Antunes, The Tao of Physical and Spiritual

I can be critical but thats different than being negative. At the airport, flight delayed 7 hours. Everyone is complaining. Whats the point? It is what it is. Go have a good meal, enjoy a cocktail, and just accept it. I too often try to find the good. Constant complaining is irritating.

It  still surprises that, at my age and place in my career, I am still seeing the behavior you so eloquently describe. I just say, I'd rather not discuss.

It is an enduring problem!