No. Not in the sense I am talking about here, which is about morally justified scientific validation of statements. You can of course say whatever you want if you are only chatting, having a non-serious conversation, or something like that. But who cares about that in this context? No one should care about such trivial stuff when we are discussing types -- especially not if we are discussing a person's self-typing. If you form an opinion on someone's type without having made a serious analysis of the types in general and how that particular person describes him- or herself, you are not taking the types seriously. And that is both morally and scientifically wrong.