"I always thought the nickname Shrub was clever and amusing, regardless of the political proclivities of those who coined and popularized it."Thats fine, as long as you don't mind being associated with those who use the name as an insult. Although if you explain yourself as well as you did in this post every time you use it, then you should be fine.
maybe that poster stops using it instead of stinking up the site with DU talk.