I’m not aware there has been any similar anti egg nog movement, so people probably aren’t as passionate about defending it.
Although I began making this post before I finished reading the above article, which suggests the pumpkin spice backlash was a result to pumpkin spice already being “everywhere,” so I guess if you want more people to celebrate egg nog, force egg nog into everyone’s faces, and then support the newly emerging anti egg nog movement until people who like egg nog start being more vocal about their love of it going forward.