My manager recently sent an email to my team reminding us to do a certain task some employees usually forget about. The task is very simple: Untick the "Allow Facebook Comments" button before publishing an article on our website (We're a large online publisher). The instruction is new and that's why some of my colleagues forget to do it at times, which is something I regard as normal.
However, it seems like he's being asked/reminded about it constantly from the upper management, which explains the tone of his email. He sent an email titled "Warning" and in the email body he said "BTW, this is not the first time I instruct you to do so. The next time, there will be serious consequences."
I'm not sure if it's entirely professional to use such language while sending us an email through an official line of communication.
It's also not the first time he employs intimidation while communicating to us, or to me. He once warned me from termination if I didn't learn video editing "fast enough". He said based on the direction the company was moving towards, they'd be firing employees who didn't adapt to new content creation techniques. I'm sure he didn't receive such warning because I talked to other managers and they said there was no such thing coming from the upper management or the HR department. He also doesn't have any authority regarding firing employees.
Two months ago, I was reluctant to file a complaint at the HR department. He usually belittled my work performance, made fun of my weight and told me several times "you need a haircut". I didn't want to go to the HR because I thought I could handle this, and because I wasn't sure of how he was going to react.
After today's incident (the email), I decided it was time to act. I'm planning to file an official complaint to the HR department, starting from the bullying and ending with the email.
I'm wondering if I have any ground for this. It'll be the first time to file a complaint during my career. How should I approach this situation?