Here's the issue: you've come to a conclusion, and then you're using that conclusion as an assumption to dismiss evidence against it.

For example: you say that it seems unlikely that Franklin considered Irish people inferior, because in 1755, Americans didn't have anti-Irish sentiment.

But the fact we're trying to determine is "was there anti-Irish sentiment in colonial era America", using Franklin's words as evidence. If you simply assume your conclusion and use it to invalidate evidence, then there isn't really a point to me providing evidence.

Something else worth noting is that Ben excludes Swedes from whiteness, despite their Protestantism.

Anyways, this isn't really a hill I care to die on, so I'll be bowing out of this discussion.