What if others say you have shortcomings? How to fight him back and make him speechless?

The best way to deal with this kind of person is not to discover his shortcomings like him, and then others will talk about it, so people will look down on you.

The best way is to attack your own strengths and maximize your strengths. Others also have eyes to distinguish right from wrong, so don't explain too much. Sometimes too much explanation is no longer an explanation, but you can speak directly with facts.

Be yourself, make up for his shortcomings and make yourself stronger. Take him as the grindstone of your life, and you will find that what he said will only make you stronger, not revenge.

All the above are personal opinions, I hope I can help you.

Hope to adopt. Thank you.