It's not just a "broad" thing. I feel the same thing the first time I do anything (but my last name is "LaBroad" so who knows!
I think it's sometimes all to do with the attitude. I imagine a conversation, even with myself, something along the lines of, "I know it's a tiny rig compared to some but I'm new and I want to know what it weighs for two reasons. One, everyone knows they exaggerate on the low side the weights of trailers and secondly, I want to be able to brag about how little it weighs. I may never weigh it again but I'd like to do 'due diligence' at least one time and know what's up."