Your point is, well, pointless.
The simple point that everyone else here is making is: If you don't like your job in customer service, well, too damned bad. That doesn't give you carte blanche to treat your customers like ****. Your personal opinions about the job, the customer, we really don't care about. We expect, that in exchange for our money, we receive polite service, since, y'know, we're giving you our money - money that can be taken elsewhere to someone who understands how this relationship works, and acts accordingly.
If you can't handle that, find a different job, because, quite frankly, nobody cares about your opinion on life, the universe and everything in the context of this business transaction. We don't care that a previous customer was an *** or an incompetent *****, because WE'RE NOT THAT PREVIOUS CUSTOMER. If you can't separate your personal feelings from your professional behavior, then take off.
I fail to see how a customer making an inquiry about a product's availability TWO DAYS after it's listed as being available, and that on a website that allows them to add it to their shopping cart, is impatient.
Your "simple point" is essentially "shut up, you should feel privileged to buy anything from me, you're a piece of garbage, and I'll treat you like that."
You defend people that, quite frankly, should be sacked from their jobs, and blacklisted from future employment in any kind of customer-facing capacity.