My friend speaks very bluntly and talks about my shortcomings regardless of the occasion. It's disgusting. What should I do?

If you are kind to him, you can talk to him, but it is usually difficult to change.

If you are angry, then ignore him. Don't worry, although you are unhappy now, if he continues like this in the future, he will have more unhappy days than you.

If he dares to continue like this at work, he will definitely be beaten, and he will know what to say and what is nonsense.