Is it a dialect training class? Because otherwise that feels like boarderline racism to penalise someone for having a different an accent.

"Da ta" vs "date-ah" is regional. If you're pronouncing it "wrong" move across the pond and suddenly you'll be right.

You just reminded me of my highschool AP bio teacher who was a new Englander, but lived and worked in the UK for a few years. He pronounced half like "hawf" and it was always jarring because otherwise his accent was mostly normal.

Your teacher clearly watched Star Trek TNG, because it's Mr *Dait a" not Mr. Da ta.