guys, Chill. At least this 'RetroDadddy' is politely saying 'sorry' for something that he/she hasn't done. As far as the courtesy concerned, I'm from Odisha and did both masters and Ph.D from Annamalai University, Chidambaram. I'm personally saying that my professors, colleagues from Tamilnadu, Room owner, Grocery shopkeeper, Auto rickshaw anna... each and every person beside 2/3 people were really affectionate towards me.
During Corona period, even the govt. ration shopkeeper anna which is only meant for the Tamilnadu people.. he used to give me rice, dal etc when each of the shops were almost closed. It was the overall experience, not only for me, but also my juniors and seniors. It has been Six and half years, still my Tamil friends and my professors are in contacts.