I see this a lot. I always want to correct people on it. But unfortunately it resides in a funky middle-ground between (a) corrections being welcome / helpful

I see this a lot. I always want to correct people on it. But unfortunately it resides in a funky middle-ground between (a) corrections being welcome / helpful and (b) corrections seeming nit-picky / pedantic. Similarly to misuses (according to classical grammar rules) of "who" vs. "whom". Both grate on me, but there's no acceptable way to get others to change.