Is it bad that my MacBook Air is passing me electricity?
Electrical current passed from e.g. a MacBook Air can be avoided by plugging your Mac into a grounded power outlet. I sometimes get this too when using a non-grounded power outlet.

I am assuming you are referring to being able to sense "vibrations" as you e.g. slowly and lightly move your fingers upwards on the palm rest?

I have found that when I have my Macbook Pro plugged into a non-grounded outlet and I touch something that grounds me - e.g. a radiator, I can feel the vibrations. If I stop touching the radiator, the vibrations cease!