In many cases if you buy something that is a normal than it most likely is. Sure there's that little possible chance it could be genetic or be a het that was listed as a normal. But morphs are worth more than normals, so people usually wouldn't list a morph as a normal.
Sometimes some users feel offended towards the choice of wording some of us use when we post. It's kind of like when someone is trying to be sarcastic over text, but you can't tel if they are being sarcastic because you aren't hearing it directly from them. We mean no harm and no hostility, but we put our point down so it is understood.