I choose none of the above.
Instead, I would speak to the postdoc in person (or call him on the phone if that's not possible) and request the same courtesy he extends to his supervisor. I would specifically note that failing to extend to me that same courtesy makes it look like he doesn't respect women above him in rank, and that such practices could hurt him in professional ways in the future, because academia is full of hierarchies.
In other words, make this a mentoring moment, and treat him as if you are helping to socialize him to professional practices in your field -- even if that's not true, and women are routinely treated like crap.
I agree with this (or if maybe a polite email if necessary). The postdoc should be informed of problems with the way he addressed you. If faculty do not address problems like this, even "small" ones, then nothing will improve in academics for women and minorities.