Can i get fired for this?

i made comment which to me seem friendly the mall work at they posted a job listing on there facebook page about hiring a food court supervisor. all commented on is i asked them why and all i said was in my opinion i don't see why we need one when we already have one technically but can they fire me for asking why they need one since im a food court janitor/maintenance employee can they do anything to me? wouldn't it be stupid they did?