Yes, there have been many times when I was waiting for a bus, waved my hand, and the driver drove past, either because it was slightly inconvenient for him to stop because he was not in the far left lane or because he had no intention of stopping at a bus stop that is rarely used.
And a bitch about those Thai Smile buses, they have the most uncomfortable seats and annoying design of any modern bus I have been on. The old yellow/orange AC buses, from Japan I think, are luxurious by comparison.