Well I would expect you to stick up for someone who left the Catholic Church since you did exactly the same. You are of course welcome back but it might be an idea - now that everyone knows you walked out - to calm your jets on the pontificating about Church Teaching to those who remained faithful. It leaves you wide open to being criticised for, amongst other things, guilt transference.

Oh, and try and communicate now and again with fellow parishioners. Jesus fed the five thousand not just one 'special' one sitting separately in the corner with a face like a burst couch. It honestly isn't a scandal for you to do that. And to cheer up a bit. 

(And btw, when the Prodigal Son returned, he didn't blame his father and lecture him on where he went wrong. It would be a good parable for you to read. Or perhaps a complete waste of time.)