Yes.
No. None of my gas boys have ever assumed that.
In fact, it isn't even a widespread myth (and it's an erroneous one at that).
There are only 2 real things you can do - 1) accept that you weren't misfilled and carry on with your life, or 2) drain your fuel now if you're so sure you have diesel in your tank.
Worrying endlessly on the forums despite everyone saying it's a long shot that you got misfilled isn't really a productive option. But hey, if it makes you feel better, go ahead.
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