I have had some asshole customers. Not many but the ones I've had are memorable - far too memorable. In September 2016 I received a call from a guy who wanted an estimate so we lined up a time for me to head over and measure the job out and give him a quote that night. Normal stuff. Emailed him my quote, he accepted on the spot and we set a time for installation for what would be a five day installation. Keep in mind that this is just before I hired employees and got big. So I needed five days to complete the upper hallway and stairs back down to the main floor. The entire main floor was also in the job.
As is usual I called him a day before beginning to confirm that things are good. This guuuyyy informs me that they want to move the main floor dates a few weeks because "the wife" wants to get all the walls painted BEFORE THE FLOORING GOES IN! In this case there is nothing I can do, I can't show up the next morning and say fuck you I'm puttin' the floor in and you're going to pay me! He informs me still in the same call that they want to keep the hallway and stairs for the following Monday Tuesday and I calmly agree to keep those dates but now I'm out of work for the week that would've been the main floor. During all this I had already turned down a reasonably large job.. I called and tried to get that one back but they had found somebody else. This had me out just over $1500. with a week off that I hadn't planned on.
Fast forward to the next week when I go to install the hallway and stairs. The minute I walk in the door the wife doesn't like me. Just, doesn't. She takes the newborn up to the master bedroom and closes the door. This was one of the doors that I had to undercut/prep in order to have the floor under the jamb rather than cut around the jambs. One looks pro - the other looks like ass.
Little hubby askes me to leave the door closed and only do what I could without opening it. Impossible and I explained it would look right. Yada yada yada I do the upper hallway and do my best given that they had my hands tied when it came to said door.
Next morning they ask me to have the stairs finished within four hours

They have an appointment at the douchery or something

By now I hate them as much as they hate me. I rushed the stairs. Not my best work but still passable. Got paid. Packed up and left. Man that bitch hated me and the
man of the house was no man..
Two weeks later I get a notification saying they have left me a google review. oh goody. 2 out of five with some rather unkind words about my company. That one still bugs me even though it's pretty much drowned out by all the glowing 5* reviews I/we have. This was an extremely condensed version. You're welcome.
Customer can be a cunt.