Tbe Bible instructs to beware of false prophets.
Jeremiah 14:15 Then the LORD said to me, “The prophets are prophesying lies in my name. I have not sent them or appointed them or spoken to them. They are prophesying to you **false visions,** divinations, idolatries [a] and the delusions of their own minds. (that hits close to home)
15 Therefore, this is what the LORD says about the prophets who are prophesying in my name: I did not send them, yet they are saying, ‘No sword or famine will touch this land.’ Those same prophets will perish by sword and famine.
16 And the people they are prophesying to will be thrown out into the streets of Jerusalem because of the famine and sword. There will be no one to bury them or their wives, their sons or their daughters. I will pour out on them the calamity they deserve.
To point out the false Mormon prophets is not bigotry but is indeed the work of the Lord.
The logic you use is twisted. In the passage you cited, the Lord spoke to a prophet to warn others of false prophets. However, because you deny the Lord the ability to call latter-day prophets, you are claiming inspiration from the Lord that you do not have and that you do not believe that you are entitled to have. How would you know that Joseph’s Smith’s visions were false, if the Lord had not revealed it to you?