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Kamala Harris is known to love Venn diagrams and would be cringing hard at this.
For reference, circles in Venn (Euler) diagrams are sets of objects with a certain property. Select objects are shown inside or outside of each circle depending on whether they belong to the set.
A good example is xkcd 2962:
If he was a mathematician with an audience of mathematicians that all knew this was wrong, the error could have worked as an extra intentional joke. However, the joke he went for could have been made without this error.
Basically, this is an unforced mistake that ruined a joke for some while having little to no effect on others’ enjoyment of it. You’re in the latter group and I recognize there is a significant number of you in JO’s live audience as well as on Lemmy, as this post is quite controversial.