“No snowflake in an avalanche ever feels responsible.” ― Voltaire

     I read this quote today.  Is this where the label "snowflake" originates?  I had to do a little research.

In Missouri in the early 1860s, a 'snowflake' was a person who was opposed to the abolition of slavery—the implication of the name being that such people valued white people over black people. This use seems not to have endured.

From Chuck Palaniuk's book "Fight Club":
In the 1999 movie adaptation the lines go like this:
“Listen up, maggots. You are not special. You are not the beautiful or unique snowflake. You are the same decaying organic matter as everything else. We are the all-singing, all-dancing crap of the world. We are all part of the same compost heap."

https://www.merriam-webster.com/words-at-play/the-less-lovely-side-of-snowflake

Now:
Snowflake: The pejorative sense of "an overly sensitive person" 

I prefer:
'Please keep calling me a snowflake. I like being different than the next person. Every snowflake is unique. They all come from the same place, but are able to establish their own identities, free and clear of any other snowflake. Snowflakes make this world beautiful.”
― Ed Krassenstein