Do you yell at customer service workers?

Never. I partly work in it myself, being the lead mail clerk for a casino with fellow employees who have the balls to dare yell abuse at me and my two assistants. I’ve learned to yell right back over the years. My assistants, not so much. But I tell them to just hang up when callers get like that. Yes, we’re there to help you with any mail inquiry you might have, but we do not have to take your abuse.