Hmmm. Well, the game doesnt know what you would actually say, so I guess it just "answers for you." Also, the game says that refusing a battle is rude, so that sums up the battle rejection part.
However, some creepypasta addicts say that if you own a Shedinja, it sucks your soul out, because you stand behind the hole in its back, looking into it. Maybe thats why you're so quiet.
Hope this helps!