Please state in which country your phrase tends to be used, what the phrase is, and what it should be.
Example:
In America, recently came across “back-petal”, instead of back-pedal. Also, still hearing “for all intensive purposes” instead of “for all intents and purposes”.
How
If I had to take a guess I would venture that this person says “It’s not my nitch.” and “wow that product is very neesh.”
I swear I’ve met someone like this now that I think about it
You got it, dialects are a widely varying thing!