@Rachel *********************
you don't even get stamped IN at the airport, you're held in the IDC lock up there until you can get a flight back to where you just flew in from OR if they wanna be hard core they make you go back to country of passport origin.
You're not banned, you're not deported, you're just NOT let in, so you can try to enter again.
At this time there are NO reports of denial of entry from people who flew in to Phuket OR Chiang Mai (just the two airports in bangkok Suvarnabhumi and Don Mueang)