Besides, one thing about online grammar nazis is that rarely, if ever are their own posts without grammatical errors. Just read through this thread. I say as long as you can make out what the person means and it's not for a formal or professional reason, live and let live.
This isn't a grammar nazi thread, mistakes happen, we all make them. There are a lot people on this board who don't speak English as a first language and they copy what they read from other users. So a lot of them are making mistakes they don't know about.
Yes, languages evolve and a lot of mistakes get eventually accepted but that doesn't mean it's right.
It only shows that ignorance spreads as fast as a disease
Novichok okay "Goodbye", I really meant to ask about "Good night or Goodnight" but I guess it's more or less the same
I've looked up on the Internet but I'm not quite sure I understand it, from what I've gathered, you write it together when you mean to say "bye", as in the last word you say. You write it separately when there are more words around it, like "Have a good night".