Criticizing, putting down, denouncing, chiding somebody is the easiest thing to do that one learns easily.
Keeping quiet and accepting others as they are in a pleasant manner, whatever they may be saying even to you sometimes, is quite a difficult thing to do.
Do some silent nature joy meditations on the above point or aspect also whenever you have time, but try not to exceed one hour limit.
Let the thoughts come and go like drifting clouds.
The one hour limit of meditation may be exceeded on very rare occasions e.g. if you really enjoy, like and love it, or you may have retired, or you may have a lot of time on a particular day.