Steven: re "He can easily opt-out at the bottom or all he has to do is ask me and I remove."
Why should he have to? - Yes his ignorance is blatant, but why should anyone have to ask you to not spam them? Did he opt in to your messages? - Of course not! It's just that you, for some reason feel entitled to waste everyone else's time because you found a way to spam everyone at the push of a button.
He should have just reported you to your ISP.