How to pronounce this word?

I don’t know why,
My Maths teacher teach us how to pronounce “mister” this word.

He said mister that t sound is d,
So we should pronounce mister as misder.
Reason is “stand”,”star” that t sound is d and it is smoother”

But i don’t believe him,
Because I never heard a man say “misder”.

I find google’s online dictionary and proof that is wrong.
And I’m right.|zh-TW&q=mister

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