I got better at not taking things personally when I had kids. Tonight, for example, my 2-year-old was on edge and screaming at me for no apparent reason. Little things set her off because she had only a very short nap today. She had a shorter than usual nap, and so she’s screaming at me. Not because of anything I did, but because of something she did.
I think it’s common to come across situations like this with grownups too. Grownups need naps, coffee, food, exercise, etc. and if they don’t get it, they might be grumpy. It might not have anything to do with you and what you did or said.