I wish more businesses would allow their employees to do this. One of my first jobs was at a call center, and as soon as the customer stopped being professional

I wish more businesses would allow their employees to do this. One of my first jobs was at a call center, and as soon as the customer stopped being professional, I would give them a single warning, and then say "since you can't remain professional, I'm going to end the call" and hang up. It was amazing! Why should your employees have to take verbal or other types of abuse from your customers?