What exactly is emergency care?
Put you in a gurney and give you an iv drip, no medication? Almost any hospital will do this. Cost: couple of hundred baht.
Give you paracetamol? Yes, they will do this. Cost: 10B
Do an X-ray? Probably. Cost: less than 1000
If they see that you need a CT scan? Cost maybe 10000? They will rarely do this. They want the money first.
If you need emergency surgery, like brain surgery because you have increased intracranial pressure, or a heart catheterization because you have a heart attack? Rarely will they do this without seeing the money first.
They will not let you die on their door steps. They will transfer you to a government hospital before you die once it's clear you can't cough up the money NOW. If you don't survive the transport that's your problem.
So, yes, emergency care is refused regularly.
And, yes, I am speaking from personal experience with lots of cases, not just 2 or 3.