Okay so I read this today. I am glad to know that I'm not the only one for whom grammar is a huge issue. I'm also not surprised that other stressors bring the irritation out more, that has certainly been the case in my world.
I thought this was interesting:
“Our brains are wired to notice what’s different and when you’re sure of the right way and the wrong way, you notice mistakes more,” says Wallin, who admits to dropping out of an exercise class because the instructor kept misusing the word “lay.”
But we don’t just notice mistakes, the psychologist notes. We also pass judgment and assign blame for them.
I quit a volunteer job that was very important to me, in part, because of the bad grammar of one of the people I had to work with regularly. I thought that it was just part of the fact that "I hate stupid people" but apparently I'm not the only one!