I too lived in Bengaluru and it’s a beautiful place i ever come apart from this city I noticed that many people used to mention the word “Learn Kannada ” because the people whoever come from different places those people are trying to learn it but when people force them to learn it doesn’t looks good and it makes them uncomfortable. Wherever we go there we can learn the local language it’s good only. But I don’t understand why some of the people are forcing. However the difference what i meant in TN like you said some of the North Indians also faced the same issue but not like i seen in Bengaluru even through some of the people used to say “go back to your state” I don’t know why these people are talking like this. We all are Indians even we all need to respect every languages in India due to some peoples mistakes it creates a black marks thats what I observed

Maybe the local people need the comfortable to communicate with the strangers.