Sure, you could say “Fuck you too. Have a nice life.”
You could say a lot of things. Lord knows they did.
Or you could try this:
“I’ve been thinking about what you said, and it’s sinking in that my email was very clumsily worded. Perhaps I should have said [insert a different and less offensive chunk of the truth here]. I’m sorry to have added insult to injury. I can only hope I haven’t just stuck my other foot in my mouth. I am beyond tired.”
Guess which approach will lead to less future engagement (which is ultimately what you want).
Sad that it took me so long to learn this. Better late than never, though.
In happier news, I am loving my newest girl so much today: