Green beer is a crime against nature. That's only my humble opinion, of course.
My sister, way way back in the day, once turned the milk we always had with dinner green. Actually, she turned mine green and hers blue. Completely spoiled my appetite and I could not drink it. I can't remember if she drank hers or not.
I stick to plain beer of a natural color and leave the green stuff to the Irish and faux-Irish.