Perhaps Mr. Anonymous is a Mss. Anonymous, looks breathtaking beautiful and the immigration officer only wanted to chat - or assumed she might (plan to) work in an odd profession.
I wonder why people post such stories on FB.
I entered Thailand via a bridge last time. So after immigration is a bus bringing me to the next town. An officer at the bus door, double checked my stamps on my passport. And he aske the same ... long after I passed immigration.
Why? Oh he liked to speak English. So? He probably recognized me, as recent years I passed there a dozen of times. But since a year or more I live in Bangkok. So did not use that border long time. So he likes to talk to me.
Would I make a post about that? Obviously not. But as a answer here it seems fitting.
And: are you carrying a weapon? I mean, a guy just stepped out of a plane, and is carrying a weapon now? One guy I know answered stupidly: the only weapon is myself (he was a Karate and Aikido practitioner), for that answer they detained him 8 hours.