The Most Dangerous Person in Your Office

After years in the working world, one begins to notice patterns. Personality types. A rotating cast of characters. Take a moment to reflect on all the personality
types you've interacted with in the office. Have you ever met the "Worst Person in Front of Me Right Now?" You know the individual. It's the person who:

Speaks to the lowest-ranked person in the room like the lowest-ranked person on the room. Bonus points for the "who needs 'em?" attitude.
Disregards people's time by showing up late or, better yet, canceling the meeting at the last minute.
Says "that's my not job" repeatedly during a moment of crisis, because hey, it's not.
Constantly suggests how someone else should do their job. "Worst Person" does this while simultaneously not doing their own job.

Micromanages everything. Nothing says "you're an idiot" more than "let me show you how to sharpen that pencil."