Are you Chinese or American? Some immigration officials don't like foreigners very much. Last time I went to bangkok immigration, one old nasty lady said my pants were short and asked me to go shopping mall buy new pants then asked 6,500B tips. Nasty. So I came to Koh Samui today. Friendly staffs, many farangs wear sleeveless tops and shorts, no body says anything. I also saw an advertisement for ED visa only 24,900 B a year, if it works for you...