It's very easy to compliment and be kind. And the ripples of that behavior can be massive.
I've learned that when I want to criticize - it's best to keep my mouth shut. I heard a great saying - DON'T SPEAK UNLESS YOU CAN IMPROVE UPON THE SILENCE!
When I have something positive and loving to say - now that's the time to open my mouth to speak.
The sweeter I am - the more fun I have! (Oh and a by product is that I win more too).