No, there are limits. They differ from a company (and person) to another but they are usually the same. Do you accept that your client does sexual harassment to one of your employees?

I work as a freelance communicating with people with Skype. If someone has a bad tone, I'll politely tell him to change. If he doesn't, I'll refuse to work with him. I'll pull a refund for him, but that's only in the case I did no work.