Yeah, obviously.
My question to him was why would he want Robin in a movie that already features Superman, his supporting cast (Lois, Perry, Martha, etc), as well as Batman, Wonder Woman, and Cyborg as well as potentially Aquaman and whatever other cameos they're going to want to put in there? It's a completely valid question.
I had my birthday earlier this year, and when asked what sort of cake I wanted I didn't say "cookie cake, and red velvet cake, with chocolate, and strawberries, and vanilla, and frosting, and sprinkles, and ice cream, and sweet tarts, and oreos, and lollipops, and-".
Seriously, at what point do you draw the line and go "no more"? How the heck do you expect Robin to fit into this organically? I mean honestly, I understand that we don't know anything about this movie but there is no way you can convince me Robin could fit into this thing naturally. You just can't.
Ok, but we know we are getting the last three. Why add one more confusing layer to this already bloated production? Just save that storyline for Batfleck's film down the line where it would be more appropriate.
Once again, I doubt this will happen because I think Snyder and co are smarter than that.