I was kind of expecting this to happen. I have been in Thailand for over 2 years on covid extensions, visa exempt stamps, and tourist visas. My passport is new so there is only 2023 stamps and visa in there. Anyway, I had a SETV from phnom penh this time and risked it going to BKK because going there by land would have taken a very long time
The youngish male IO asks my purpose of visit and I say travel. He then says you need to talk to my supervisor and hits the yellow button on his desk. The supervisor was a very tall man. They talk to me for 45 minutes. Saying that my border bounces to laos were 'illegal', of course I did not contest anything they said. They also said that because I am on short term visas and I have not returned to my home country in a while the immigration views my passport sub optimal. They also told me they don't like student visas. I had 20K baht on me but was never asked for money, they asked if I had a flight out. I said yes to a neighboring country, they said that's not ideal but did not ask for proof. They also asked if I have hotel booking and I showed them my last TM30 and said I stay there. I explained my main reason for being in Thailand is I have a Thai girlfriend and we might get married soon
In the end, they let me in. If I continue staying on short term visas I'm never flying in again. Land borders only