Some grammar rules, like discouragement about starting sentences with “And”, are so last century. Others, like dangling participles, are invisible to the average person. Even writers aren’t too bothered if they’re used outside of fiction or journalism. I’ve never scoffed at someone’s Facebook post because they used a dangling participle.
And others, like misuse of homophones, cause such universal revulsion that we jump to assumptions about the error-maker. “What an ignorant buffoon! Who could confuse your and you’re!?”
I’ll admit that homophone butchering, when repeatedly committed by the same person (we all make a few late-night mobile typos), bothers me. But there are some grammar and style conventions that, when ignored, really make my skin crawl. Honestly, if I see them in a published novel, I will wonder if the editor was on a mental vacation.