Do you ever think about how you might have had a perfectly benign interaction with someone in meatspace, and a negative one online with the same person without realising it? Or vice versa?
Like, a stranger might have held a door open for you and you cheerily thanked them, neither of you realising that you'd called them a Tory prick on Twitter that morning. Or you said 'watch it, cunt' to some clumsy clot in the pub, and earlier you'd liked their picture of a butterfly on Instagram.