I (usually) get along reasonably well with my ex-wife, but recently she voiced a complaint that I had corrected her grammar and spelling whenever she was wrong. I don't remember this. I thought I was always diplomatic even when she said things that made me cringe.
Oh, well, I suppose one can't have an ex-wife and not expect some criticism...
After 10 years of being single, I married a woman who had perfect grammar. Problem solved.