No matter what you feel about the Poser bias (which is totally unjustified BTW) this doesn't change the fact that it's quite real and pervasive in the 3D industry. There is nothing you can do about this really, if you want a job, don't mention that you use Poser unless the job is for a 3d-related field like illustration or something. And even then you should be presenting your work as illustration/2D done in Photoshop/Painter and not a 3D render in poser.

Plus keep in mind that Poser is not the best medium to show off your skills in the first place. Poser makes things too cookie cutter and easy for you. eg if your render has V3, lights by A, clothes by B, backdrops by C etc, then anyone with the same kind of props and presets will get the same result from poser. This makes it very hard for a prospective employer to evaluate just what was 'your' contribution in a work. ie why should they hire you instead of the next guy doing the same thing ? Of course you may have made a better composition and scene, but frankly that isn't as important as you may think, since all that stuff is already decided (by the design, storyboard and concept guys) way before a scene ever reaches your computer.

Sure its different if you are your own boss or are working freelance or something, cause then only the results matter and as long as they are under budget/on time no one cares what you use.