Glory design & construction Very unprofessional, rude, uncooperative, threatening attitudes Los Angeles California

This guy changed his attitude after I made a deposit, making it hard for me to work with him.  When I had to change my schedule due to unexpected events, he acted irritated and yelled. He was very difficult to discuss or talk with during the whole process of the work. Very rude and unprofessional! 

I posted his review on one site. After seeing that, he started threatening me, saying that he will sue me for defamation and do against me at whatever costs. Is that retaliation?

He shouted, yelled at me, kicking the stuff in my place & slamming the door, when he came to my house. I felt like he would kill me. Instead of apologies, he kept very rude attitudes, sending me threatening and nosense messages.

I am trying to find a way to protect myself.

Be careful of this man.