>That depends on whether the word "Enemy" has a singular vs. plural connotation.
No it doesn't as the verb to be, in this context, is related to the subject - Everyone, which includes the clause "including the enemy".
You may see and interpret it any way you like, but that doesn't mean you're right.
GK loves the pungent aroma of irony.
However, when it comes to Q and Trump posts, spelling and grammar do matter.