Facebook Grudge
A long-lasting hate for someone who didn’t respond to your Facebook message. It’s like they’re ignoring you in public and you’re not going to forget it.
You messaged them about the party and they didn’t reply. You went to the party alone.
You sent them a funny meme and they didn’t reply. You posted it on their timeline.
You commented on their post and they didn’t comment back. That’s a full-blown grudge.