My son often talks nonsense in crowded places and never speaks through his head, which makes me embarrassed in front of my friends. They say my son has a brain problem?

To avoid embarrassment in front of friends, you don't have to be in the same place as your son. Moreover, everyone's ideas, viewpoints, thinking and expressive ability are different. You think your son talks nonsense in front of people, but your son may not think so. People who agree with your son's point of view think he is normal and don't think he is mentally ill. A 20-year-old boy, full of blood, may have a straightforward personality and a vivid speech. I blurted it out without thinking it over. As a father, you should forgive him for being young. Teach him patiently at ordinary times, don't be impatient, and let him learn to think and speak slowly. I think as I get older, he will be a good son who won't let you down.