Why do people from Delaware speak so strangely?

I agree, OP. Ryan Phillippe really has this manner of speaking.

I know several people from Delaware and they don't speak in this manner.

Delaware has a strain of hick accent that is quite harsh, a cross between Eunice of Mama's Family and a NASCAR driver. High in pitch, agitated, in a great hurry, and chopping short the ends of words in a staccato.

It's as manufactured and imported as NASCAR, with only a tiny kernel of geographic specificity: it's generic American hick with a big pickup truck, just at a slightly harsher, choppier Clio.

It's found especially in the Southern end of the state but not exclusively. It's an aspirational accent learned from select family and friends but in softer versions bleeding into the language in a broader way, a general hurry to truncate words and move to the next and a high pitch.

In the Northern part of the state, there is less of the cultivated hick accent and most people with even a little education sound more or less Mid Atlantic newscaster - a few odd Philadelphia or Baltimore influenced pronunciations creeping in on a small group of words. It has a bitch more pitch and hurry to it than it should, but is often noticeable only in specific words.

Aubrey talks more like a worthless Valley Girl than anything else.

Bitch, you're a millionaire for voicing Grumpy Cat and reading other people's lame jokes to Amy Poehler. Crack a smile once in a while and get some goddamn sun!

Aubrey Plaza is odd whichever way you look at her. I’m a fan.