North Indians generally seem confused about South India. They/You all get weirded out when they/you realise that South India isn't all in Tamil Nadu, or that there are other things than beaches and that most people don't like speaking Hindi. Aww, see nobody really cares but it's irritating. So, in the common interest of both parties, we clarified some things.
Also, pick up a map sometimes. Not all South Indians are Madrasis. It's doesn't make you sound cool. It's just dumb.