just down vote any thread with xur (or the name of the crap he is selling) in the title. No number of words or votes will ever change/influence Xur in game. Stay focused on things that do matter and maybe we the community can affect this game positively.
Another thing, if you're not offering feedback to Bungie regarding Destiny, stop using #feedback. Crying about crybabies isn't feedback and neither is addressing the community (as I am here). Even positive threads that offer constructive criticisms of the community are still not feedback.