I am self employed within my own small business client facing
I potentially on average work face to face with anything upto 40 clients a week sometimes and hand in heart I don't feel negatively towards them at all
Most of them have been loyal clients for many years
They stay with me because I provide an excellent service but I also have fairly strict boundaries in place
These include notice of any cancellations or a fee will be due. If the fee is not paid they are no longer allowed to book.
On the other side of the coin I've had clients that have insisted on paying the fee due to late cancellation even when I've waived it due to it not being their fault.
I've never had to chase anyone for payment because they pay before they leave the premises on the day.
If anyone emails messages or calls out of working hours (most don't anymore to be fair)it is left unopened or I replied to until the next working day.
If I have ever had to move a client due to running over etc I have always given them a percent off of their bill to show I appreciate their time is as important as mine and vice versa.
I've only ever had one person be rude to a staff member over the phone and they were calmly told by myself that sort of behaviour is not tolerated and an apology to staff member was made and it has never happened again.
I have been in the same role and business for nearly 30 years op,I treat my clients well with little extras and they treat me well.
You sound very angry and frustrated which is a horrible place to be.
I have had times where I've really dreaded going to work and then I remind myself I'm in a very lucky position because of what I do and the clients
Maybe you need to step back or out for a minute