The only thing MCR and Green Day have in common is that they both wear black, haha.
I am personally not an MCR fan, but I have respect for them. Especially since they seem to speak highly of Green Day and apparently consider them as one of their influences.
In all honesty, I don't understand why people argue over bands. If you don't like that band, shut up and don't listen to them or pay any attention. People will never cease to amaze me with their flatout stupidity.
"Frerard", by the way. You did spell "happily" right :-)