I prefer not to fly around in a Mardi Gras float, and I'm disappointed in my company that they are forcing me to do so. If you want to go join the parade, go for it. Just don't force me to be a part of what I find to be disgusting.
Fine, refuse the duty. Call the Murdoch press beforehand; it would be a shame to go without a bang. But get your logbook in order, Emirates might need to see it. Have fun. The 99% of us who don't share your abhorence won't miss you.