Context has all the relevance... If you are, for example, Muslim and everyone starts saying "zommg i hate all muslims and they are all terrorists" then that is quite offensive and if you get the wrong person that doesn't tolerate it, there ya go! Saying shit like that is stupid and unnecessary.
Personally I don't care what people say because I know either 1) they are trolling, or 2) its their view and opinion and if its intolerant, thats their choice.
You obviously said something offensive enough to offend that person and receive a ban, so I doubt it was a minor infraction.