You're wrong here, as is anyone who criticized Sharpton for ignorance of our history.
What Sharpton said was this, from the link you posted:
“One day our children’s children will read American history. And can you imagine reading that James Madison or Thomas Jefferson tried to overthrow the government so they could stay in power?”
Sharpton was referring to actions they (never) would have taken to subvert the peaceful transfer of responsibility subsequent to their presidential terms, NOT their earlier actions in the Revolution.
So Sharpton may be - is - a loathesome turd, but he made no error in regard to history.