Full Idea
One major argument against the view that essences are real is the rampant essentializing of categories that are socially constructed (such as race, caste and occupation).
Gist of Idea
A major objection to real essences is the essentialising of social categories like race, caste and occupation
Source
Susan A. Gelman (The Essential Child [2003], 11 'Is essentialism')
Book Reference
Gelman,Susan A.: 'The Essential Child' [OUP 2005], p.299
A Reaction
You can't argue with that. It raises the question of whether the approach of scientific essentialism has any value in the social, rather than physical, sciences. We jokingly essentialise groups of people such as referees or Oxonians.