so you actually had your own mic ready to go? if so, and if it was a decent mic capable of capturing the low end, then yeah, that's pretty douche-y on the soundman's part. (as well as self-defeating, as a good SVT into the right mic is a thing of beauty.)
i do a lot of small-club sound, and at my current semi-regular house gig, there's no extra kick drum or floor tom mic to use as a dedicated "bass mic", so i routinely go direct from the bass rigs. even so, i always try to get my signal from the amp's direct out, preamp out, or effects send, so that at least some of the bassist's amp tone makes it into the PA. (if his amp tone is so bad that i can't fix it, necessitating a DI box right off the bass and the resulting dry, bland sound, then the band likely has bigger problems anyway

)
now when i
play bass, it's a sansamp right into the PA, and also feeding whatever power amp and cabinets i scrape up. "my" tone always makes it to the PA, cause that's the only thing the soundman will get from me.
someone else wisely pointed out that our goal as bass players (as players of any "electric" instrument, really) should be to do whatever it takes to create a tone that works in the house, and be able to put it into an XLR cable. whether that's a direct out that actually sounds like we want, or a rig mic'ed with our own (proper) mic, we should be able to say to the soundman, "all i need from you is a mic cable."