I understand and fully sympathize with your sentiment about the ball-less stances of recent Thai governments on world issues but factually, your statements are completely incorrect. They were a major contributor and host to the American forces during the Vietnam War (Pattaya wouldn't be today's Pattaya without the U.S. G.I.s back then). A quick search on Wiki yielded: "About 40,000 Thai military would serve in South Vietnam, with 351 killed in action and 1,358 wounded." Also, "During the course of the Korean War, Thailand dispatched a total of 11,786 soldiers to Korea. It is recorded that 129 Thai soldiers lost their lives in the war, 1,139 were wounded, and five were missing in action (MIA)," also according to Wiki.
It is true that the Kingdom "chose" to be neutral during WWII, on the surface politics, but their silent choice in reality was taking of the side on the Axis. Remember River Kwai? Japanese still came onto Thai soil to carry out their military objectives and commit atrocities against the Allied troops.
I wholeheartedly agree with you, however, their stance and initial actions on the Russian invasion of Ukraine were disgusting.