Bossy Brat. Closely related to Sudden Commanders in Chief is this garden variety of TOT, who can remind you of your old schoolyard days. They are more demonstrative about what they want you to do, without authority. Of course if anyone is acting like a bully, or unlawful in any way, you should report their actions to their supervisor or to Human Resources. But in many cases, you will find this bossiness to be irritating, stressful or unproductive, not necessarily lawsuit-worthy. And so your first effort should be to communicate, especially since this person has no technical authority over you.
Ah, thank you! How timely! 8D