CRITICISM should be a suggestion, not a demand. Forceful advice may push others away rather than help them. A positive personal example is more influential than many words.
Criticism and advice too freely given are seldom appreciated. A wise level of restraint is a safeguard against many mistakes. It is better to say too little than too much.
When you look for the best you will see little of the worst. You should be too busy taking care of your own life and working to elevate it to the next level to constantly criticize others. The good you think about other people influences them unconsciously, even though you do not express your feelings to them in words.
The purpose of criticism should only be to help and encourage. Give your best to others, and they will ultimately give their best to you.