OK, you didn't say "douchebag" but that was the intent. But that is SO not the experience I have. I will get that occasionally, but when I pull out my Heil PR 40 and Z Bar, they usually back off. Also, very few soundmen will complain when I ask for a mic on the road. Some do if it's a big show with limited channels, or if they're lazy, but more often than not, they list off their available mics and ask me which one I want to use.
Of course, I'm not playing originals with 6 different bands using the same PA and demanding completely different everything, so I can see where a soundman might not want to go dig for a mic and stand in those circumstances. More often than not, we're the only band or the headlining band, so I guess I'm spoiled by the ability to boss soundmen around most of the time

And the network of soundmen I work with regularly who I don't have any power over love everything I do so they never question it. But the soundman on multi-band gigs has to make set changes quick or they lose precious alcohol income, so they may just not have enough time to make you 100% happy. So you should bring your own and plug the DI line into it. And really, the soundman should have a bass mic available as well as a DI, but there are other extenuating factors that go into them not being as willing to accomodate you.
This is where having a winning personality has a LOT to do with how the soundman treats you. But just like everyone else who replied, I'm not feeling the warm fuzzies in anything you're saying, so why would we assume you're any different on a gig?