Pond scum?  Really?  
Disapproval is not dehumanization.
Personally, I disapprove of people who vote for Democrats.  But that does not mean I think they are less than human.
In America, no one is disenfranchised by anyone other than themselves - whether by their actions or inaction.  Even the felons that are actually disenfranchised brought that on themselves. 
The only place where you can go in this country where they preach killing people because of their group identity is the public square where you will hear that Islamic jihadists should be destroyed and certain big city mosques where the same fate is advocated for certain folks who are not Muslims....and some that are.