It does not really bother them. There are two India, which has TN as a state and another for the Tamils who think India is inside TN.
Once a Tamil told me (and he a graduate engineer) that anything other than TN is "North" India. So Karnataka, Keral, AP all in Noth!! So repeating, never need to tell them anything on that. Just inform that you do not know Tamil.
6. Rule - 6: ------------
This is for professionals. Think ten times before you join a company run by Tamils.
Everything will be Tamil...the meetings, the discussions, your cubicle discussion, the functions/parties. And if you talk that to your boss, may GOD help you. He just another developed version!!
Yes you guessed it right, as it is run by these creatures, they will only try to recruit from their own species. So look before you leap into a company, it can a trap you ever dreamt of in your career.
7. Rule - 7 : -----------
Tamilnadu is full of pseudeo intellectuals.
Tamils always think they have all the intellectual capability, beauty etc, etc, etc. They will tell that they invented zero, Sanskrit is a non descript language, Chennai is the most cosmopoilitan city, Aiswara Rai is from Tamilnadu.
The list is never ending. So the rule is, never argue with Tamils in TN. Remember that niti bani ... "Never argue with fools". Apply this rule purely here, period.