Baseless accusations, because what bothers night people in the morning, bothers morning people in the night.

The only real difference is how much you care about how your actions impact the environment and people around you.

I wake up early, because I work early, I don't make any sound, my flatmate (I rent a room from the company) works late and always stays up late, they make so much noise that they keep waking me up to the point that I had to report them to the company.

It doesn't matter if you're a night or a morning person, what matters is, are you considerate or not.