Not getting into a fruitless debate and/or antagonizing somebody that doesn't have any interest in being reasoned with.

It's quite possible that he reported you to Adsense specifically as a petty demonstration of the "power" he wields. And while your site may have been your only income, his was probably one of dozens more, so it didn't really matter to him.

Short version: you had a lot more to lose and nothing to gain compared to him.

that's life I suppose, fortunately I have a job :)

And the blogpost you made is ultimately feeding the troll. It is confirmation that he "won".

Even if you do care about these events, sometimes it plays to your advantage to keep things off the blog.