What on earth makes people so inclined to be snippy? I surmise it's the immediacy of spewing bile right onto the phone or keyboard, rather than having to actually interact with another human being.
Ah, Bumrungrad... I live a few hundred meters away, and have had surgery and 'scrips filled there (they will write for anything and everything, by the way) but they are, indeed, pricey. And they don't care for walk-ins. On visas or any other service. But.... Talk about quality care? Wow.