Wrt running to HR... Seriously? HR is required to bring in Delta legal on this type of issue... the offender Will lose his/her job...(or at a minimum, a very large stain on their record... i.e., better not have any other issues in your career).

How about this instead... have the stones to say something to his/her face... I've done it... not that difficult.

In 25yrs, I've not once considered turning in a fellow pilot for what he/she said/thought... would not want someone fired because they're a jerk.

I've seen this "turning in" behavior with FAs over the years, but never with Flt Deck crew... hope we haven't come to this in our profession.