You are missing the point. Manchester United are only known as 'United' because "neutrals" keep doing it. It is disrespectful to all the other Uniteds, especially when the club forum you are doing it on is one.
I don't refer to us as United that often, because, again, it isn't our name.
Id say you’d be in a minority of one if you’re genuinely saying you’ve never once, in a pub conversation or wherever, referred to Manchester United as United and you ALWAYS call them Manchester United. Really ? Sorry but I don’t believe that, I don’t know anyone who does that. Same with City I assume ? You always say Bristol Rovers ? Never just say Rovers ? That might disrespect and offend Blackburn fans. See just how ridiculous this is !