"I'm not complaining, I'm just stating a fact".
You're not wrong, it is a fact. But breathing life into it by giving it a voice brings greater awareness to something negative that you have no control over. That's bitching. That's complaining. And its poison.
Don't be the poison. Be the antidote.
Think about the "facts" you say before you say them, will it benefit you or anyone around you by complaining? No, then why say it...
Negative people are always going to be everywhere you go, you yourself may even be negative at times, or mindlessly complain about something as simple as bad weather.
Remember, it's only a bad day. Not a bad life.