This has been done many times before and I can't think why I am needing to do it again, except I have seen it used twice on here this morning already
.
It's offensive. It's not JUST a word. It's no less offensive if you prefix it with "emotional" or use it to describe some silly thing you or a friend did, or some bloke you saw with his trousers half way down his backside as young men sometimes choose to do.
It may be that some believe that the use of this word is considered acceptable in other countries (ie the US) and this often trotted out as a reason for its use but that is not actually true here. As of 2014 the American Psychiatric Association plans to replace the term 'mental retardation' with 'intellectual development disorder'" in the 2013 edition of their manual.
most offensive terms used in relation to disability.
HTH.