Asking you for your name and number does not rise to the level of harassment. Behavior doesn't become harassment until you tell the person to stop and he continues the unwanted attention.

From the OP's letter, unless something is missing, all that happened is that the UPS guy asked for her number and asked to get together for an activity that the OP didn't agree with. There's no indication that the UPS guy was stoned while on duty and no indication that he continued to bother her after being told no.

I fail to see the big deal and don't understand the drama, especially in reference to the boyfriend.

Men ask women out all the time. It's not a reason to blow a gasket even if they ask you to smoke a joint after work.