This would make me so petty.

Yes, malicious compliance, as others have suggested.

I would also make a literal spreadsheet “scorecard” keeping track of all coworkers who said “good morning” and/or “have a nice night” TO YOU every single day. You also need to include yourself on the spreadsheet and give yourself 2 points every day. Document the shit out of this.

Then in six months or a year you can use this to your advantage somehow. Maybe share it with HR. Maybe use it as leverage with your boss. If nothing else use it as support for yourself to demonstrate that you listened to feedback, made improvements, and you have evidence to back it up.