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Another question to ask those people. When was Lee’s trial for treason?

Eh, that's a decently different argument. Lee wasn't tried due to various factors such as Grant's pledge of honor, and the fact that the north didn't recognize the Confederacy as a separate sovereign entity, so there was no actual war declared, therefore no treason as defined by the Constitution. Plus, even if it was, the majority of the fight was a North-aggressive war, purely defensive for the South. Hard to argue treason when you're the one levying the war, not the other guy. And, if the North accepted the seccession but still fought to bring the South back, that would be admitting the States were no longer part of the Union (temporarily), and therefore not subject to the Constitution during that time, which again means no treason charge would be valid.

If you read about Davds's trial, it was a boondoggle and after two years was eventually dismissed of the charges. And, it's all mostly moot anyway since Lincoln / Johnson pardoned many and eventually issued a blanket pardon for all Confederates.