SAP Dude, the minute you replied, i knew that you were being sarcastic and i totally understand your sarcasm. I myself used think that Thakuri's are different but later after reading the history of Nepal and Nepalese especially the book of Dr Harka Gurung, i realized that Thakuri's are Chhetri's. The reason Thakuris don't consider themselves as Chhetri's is because of the Royal Family of Nepal who are also a Thakuri's. Thakuri's are originated from Chhetris, It's just that they wanted to call themselves different because lots of Thakuri's i myself have seen are very proud of their surname which i don't understand why? Also one of the other reason is may be because of their high class lifestyle. I am sure you've seen of the Thakuri's, Rana's (Hune KHane wala haru) That might be the reason. 

But there's nothing to do with what you called your mother because i myself is Thakuri and i called my mother as Muwa. I don't know what in the world makes your laugh your ass out of that.