They probably thought you were a spambot or a troll.

All y’all are hypocrites

Karma’s a bitch.

Your family sounds really immature.

why are family group chats even a thing

there's a difference between ignoring family chat when a reply is expected, i.e "Are you coming over for dinner tonight?" vs "Good morning". Besides, they're just giving you a taste of your own medicine!

If someone wants a response from me they'll have to talk to me and not just dump it into some group chat. Who always reads everything in a group chat?

I do. Because it could be directed at me. And I have two seconds to spare.

Maybe they meant replying to deeper conversations? Sure you say your good mornings, but I doubt your family would bother with group chat if that's all they did.

Family group chat that your expected to always read and reply to? That sounds pretty controlling and kinda creepy.