Oddly, we watched this last night. Again, like "You", very divisive. I loved it, wife and kid didn't. Then again, I had to explain a lot of the in-jokes and sly references.
I get the argument about "fiction", and agree, but there is a fine line there. I've been kicking around the idea lately - after having watched "Hidden Figures" - that it's actually quite dangerous to go back and revisit the past with the lens of the present. We don't advance our civilization - or at least, our society - by going back and ret-conning the persecuted and down-trodden into social justice warriors.
Tarantino got most of the facts right, up until the moment Rick meets the car in the cul-de-sac. Even the spots where Rick/Cliff/et al. get inserted into real-life situations - the "Lancer" episode, "The Great Escape" montage - the underlying facts are pretty close. I get it, I was the same way - what are we going to see?? - but he got the George Spahn thing right; that's more or less what happened ("Squeaky" Fromme got her nickname because that was supposedly the sound she made when the blind George ran his hand up her leg).
I think QT is fine here, because he changed such overt, obvious facts, but I don't think all film-makers are so diligent. That whole arc in "Hidden Figures" about walking to the bathroom... never happened. Katherine Johnson (Taraji P. Henson) just used the local bathroom from the get-go, and no one complained (well, one person supposedly did, and it was summarily ignored), and there wasn't a need for the ceremonious destruction of the sign by a woke Al Harrison (Kevin Costner). Who does that serve?