When are you people going to understand that people like this always follow the same playbook?

1: Come into a new place
2: "Heh, I'm kind of important 😏 "
3: "Here's what you're all doing wrong, do it my way"
4: Outrageous suggestions
5: Enjoy the attention from reaction to outrageous suggestions
6: Keep pushing the same shit until weak people acquiesce, then KEEP pushing in the hope it becomes normal

It works in some places, but it won't work here, it's just fucking annoying. Either show them nothing but unwavering malice, or ignore them.