Not true. Last year I travelled 4 times to Thailand. The last visit I was questioned a lot and the officer asked a supervisor if it was ok to let me through. My first trip this year was ok but for my second trip in May the officer had attitude. (Checking everything and taking a long time. ) Lucky I had an evisa. I feel I could have been rejected if not for the evisa.
I did feel the IM had some attitude on the day. I also had an eVisa. She wanted to see that too. Lucky I had one i think. Mostly I rely an a visa exemption.