I was looking for " rude,offensive,degrading,vulgar" word in tr lang and as usualy I bumped into zilion words in dictionary.Now I would like to know which one do native speaker use when they say: "why are you insulting me?" or :"why are you offending me?",,,as in:he/she says something very rude/vulgar/offensive and I don´t like it at all, am very offended and I´m wondering with what did I deserve those words:
-niye alçaltlısın?
-niye edepsizsin?
-bana niye kaba sabasın?
-niye bana hakaret ediyorsun?
Sorry but english is not my native language so I have to write examples to get correct meaning in my lang 
The verb "hakaret etmek" is what you can use widely.
