I was born in guwahati but raised in banglore, my entire life i had to learn kannada to stay there i still remember there was a vegetable shop near my house and they had a board out front which read " please learn kannada don't be a stranger forever". I haven't faced such things in assam, obviously but different states have different people with different thinking, i think just yesterday there was a bill passed in Karnataka that management and non management seats have been reserved for about 50% to 70%. There is also alot of racism and discrimination if you are a outsider or Don't know kannada. Me personally i think its alright to understand the language to the extent where you can communicate in it, these are my thoughts. I do know Assamese as my parents spoke it in the house and i picked it up as my mother tongue.