Why do North Indians, living in Bangalore, not bother to learn Kannada?

Because it's not required otherwise they would be comfortably speaking your language.

I have been to Bangalore,never felt like a need to know the local tongue because hindi is commonly understood.

I mean it's hilarious that without any specifics,they tag crores of people as Bimaru though affluent people never really care about BIMARU but they do, probably they are even worse

Can you fly an American flag in the UK in your own private property there? What is the UK’s government stance on that? And if yes, do you also have to fly the UK flag or the American flag can fly solo?

In reality ( not on social media) people care about relevant things.

Bimaruuuuuuu.

India has amazing potential,don't kill it for your petite ego or lack of self-esteem

Physicists create 'the world's smallest violin' using nanotechnology - Phys.org

I have grown up in the north and there were many southies around,we never really bothered if they knew Hindi or our local language because our relevance /existence isn't dependent on them.

On Quora you can make any irrelevant thing into relevant by adding a spice called identity.

Mostly I see faceless people getting their daily orgasm by calling others Bimaru.

Dozens of Israeli children develop malignant tumors from sperm donor - The Jerusalem Post

People don't mingle because they speak the same language but they usually mingle out of need and interests.

In reality even if you will get a single person who cares for you,listens to you then it's nothing short of a miracle but it's beyond my understanding why people are wasting their precious time in fighting for the self created issues.

If they will show the same dedication in the right direction then you wouldn't find a single poor person in Karnataka.

Facial Stimulation Clears Brain Waste and Boosts Aging Minds - Neuroscience News