Everyone is different; if you lined up a random 1000 people from different countries, none of them would share the exact same skin tone.People categories people skin colour as 'black' or 'white' which creates a divide you are either 'black' or 'white'. Why can't you just not categories by skin colour?. Some of that 1000 people may also be straight, gay, lesbian, bisexual- any sexuality. Some may wear glasses and some may not.We could categories those 1000 people from every physical trait they have.

Genocide (the deliberate killing of a large group of people esp. those of particular ethnic group or nation) is what Hitler performed in World War 2 where he dehumanised and killed people for being Jewish, handicapped, homosexual, Polish, a gypsies, Jehovah's witnesses and so many other people because Hitler thought that being different was wrong. 
  The first step to genocide is classification/categorising; this is something we do everyday which basically makes us all a bunch of potential Hitlers.
   Everyone is different to another so why label certain people for being different to you when you're different to them as well? 
Why do we have to categories anyone?

new year, new you

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