This recent post I made was found to be off-topic. In my mind, the meaning of many terms is intimately connected to the context in which they are expressed. I asked for help validating my intuition that workplace bullying is not equivalent to making demands or giving an ultimatum. It is important to know what workplace bullying is vs. the normal processes organizations go through to hold employees accountable. I think this would be an entirely relevant topic for discussion.
Your question was not closed because it asked about the meaning of a term. Your question was closed because it was just story about your situation and didn't really ask much of a question. Your post basically amounted to "Look at this thing my boss did! Isn't that weird?" You want us to validate that you are right and your boss is wrong.
As the close reason cited, Real questions have answers. Instead of asking a question which invites answers like "Yeah man, that's weird," it's better to ask a question that has a specific goal in mind. You could have asked, "I know my email was unprofessional. How should I have better handled it?" Or "I'm being accused of bullying behavior. How should I respond?"
Additionally, your question about the definition of bullying and whether a bully always needs to be in a place of power is not specific to the workplace. It is really a question about the meaning of a word and whether your boss used it correctly or not. That is a question better suited for sites like the English SE, though you would need to cut out a lot of the backstory before it would be appropriate for that site as well.
The reason your question was closed is actually revealed by the way you started this one. You said "The recent post..." It was wasn't supposed to be a post, it was supposed to be a question.
If that wasn't enough of a clue you ended this question with the phrase "I think this would be an entirely relevant topic for discussion." again the purpose of the site is to ask questions, not to have discussions.