Definitely a weird email, strangely written. I get the impression that the first draft of this email read much differently, as there seems to me to be several revisions and more than one hand in concocting this mess.
It swings back and forth between being threatening to be conciliatory back to being threatening, etc. This makes it confusing to the reader and obscures the point. What is the bullet point meaning of this memo? I don't know?
It is likely he had a fit and wrote a scathing letter to express his feelings about Trump and his supporters which was later revised by HR and a lawyer.
I would be very surprised to receive a memo like this expressing disdain for the soon to be President. But the most egregious part is a memo which has the term 'email your resignation' in any context. This is unprofessional in the extreme and obviously a reactionary statement.
Again, weird and strange. I can't really tell what he is getting at. I guess he thinks Trump supporters don't buy food, or that he doesn't need their business. This will not work out well for the company, not matter what it was intended to be. That is the one, and the only thing that is clear about this.