I'm that guy who farted in the office
Are you sure you farted in the office?
Yes, I am the guy that farted in the office.
Most people find the smells of farts unpleasant. You can excuse yourself from the room before farting next time.
I don't mind even if it smells bad.
If you continued this behaviour nobody in your office would want to be near you. You should pass gas in private. It's rude and disgusting to fart in public.