Oh no you don't LOL! I know how that one goes.
I believe and practice that gift as per the scripture. If I am not mistaken, you do not believe there are unknown tongues. Well, to that I can say if a person does not know every language on earth, both current and no longer in use, then they can never say that the use of what is to them an unknown tongue, is not of God.
There are supposedly 7100 languages currently at use in the world and it is believed that there are 573 languages not in use or extinct. I don't suppose any of them are extinct to the Holy Spirit. I do not think anyone could possibly state that with the possible use of over 7600 languages from which to choose, they could tell that it was fake. I can't answer for those who just go 'nah blah nah' all the time. I don't do that.
Please note, I am not talking about the possibility of the language(s) of angels here as there is just one mention of that in scripture I think? but I don't think we can just dismiss that either, but I am not insisting or creating a doctrine about it either.