Well you could laugh it off, I doubt those that would be sucking up nuclear fallout would agree, and YOU are Super the people you love not so much.
As for making a compelling case to wipe out the human race, to the rest of the planet you would seem like a fucking GOD, some might worship you immediately, others would distrust the fuck out of you and find a way to account for you and demonstrate they can get a handle on YOU being the situation.
Most would react out of fear, many would react out of misguided ideas, the question isn't whether you can DO anything you want, the question is SHOULD YOU, and how would you do it.
Because make no mistake with that gift there is literally nothing physically can't do.