Here are a couple of stereotypes which I have heard from instrumentalists whom I have known:
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Some university students have noticed that instrumental students do better in sight-singing class than vocal students.
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Since instrumentalists always accompany vocalists and never the other way around, they get the idea that they are superior to instrumentalists. If they make an error in rhythm, they expect the instrumentalist to accommodate that error.
Here are a couple of jokes which I got off the Internet:
How many sopranos does it take to change a light bulb?
One. She stands still while the world revolves around her.
How many sopranos does it take to change a light bulb?
Two. One stands on a chair and the other pulls the chair out from under her.
I plead guilty to holding these stereotypes myself.