Customers that want you to design a logo. They give you no real specifications other than a name, even that sometimes can be a bear to get from them. You then spend a good amount of time designing something, many times several options. You submit the logos to the costumer and they now have a list of ideas that they didn't have before. WHY DIDN'T YOU GIVE THAT TO ME FIRST!?
It's not customers. It's people in general.
But as customers they feel in a higher position (because they pay you money) and sometimes think they can get away with a bolder attitude -- especially on the phone because from their perspective they talk to somebody they don't know and will never know. That unlocks inhibitions they would normally have in a face-to-face chat.
It seems that women are especially prone to being impertinent in such a situation (from my own experience with customers), especially when they have no idea what they're talking about. I often feel that most men have something like a built-in safeguard that protects them from embarrassing themselves too much but strangely enough many women seem to completely lack that feature.
I can give you a current example from about a week ago. When you apply for a loan or a credit card in Germany, you have to prove your identity by going to a bank, a post office, a lawyer, a notary or a tax consultant, who then witness that you really are the person you say you are. Going to a post office is the safest way because they fill it out on their computer, while everyone else needs to fill out a form by hand. Also a post office is completely free of charge, while others might want some money for the service.
The regulation came in its current form as a reaction after 9/11 to make sure nobody uses a fake identity for money laundering. It's a law, so there's absolutey no way around it. And the necessary form needs to be filled out in full and precisely as indicated. Anyone who can read can do it. Nevertheless especially bank clerks, lawyers or tax consultants often get it wrong anyway. But I'm degressing...
Said female customer apparently didn't want to mingle with the commoners, so she decided to let it be done by her notary, who charged her 126 Euros for it -- and promptly did it wrong. So she received a letter that sadly the form was invalid and that she had to do it again.
Now guess who she blamed for it? Exactly. And she wanted the 126 Euros back from us. Why, you ask? Probably because she simply was a bitch who wasn't afraid of embarrassing herself. Our remark that she could have gotten it for free and probably correct at a post office, didn't help, because apparently she rather paid 126 Euros than waiting in a queue. Naturally she didn't get the money and neither did she get the credit card because she withdrew the application...
Some people, seriously...