What is your definition of "snowflakism"? It's not a word according to the dictionary, so it's doesn't have a clear definition.
The term "snowflake", can be used to define a person, as a slang term. According to Wikipedia:
snowflake - Wiktionary
Someone who believes they are as unique and special as a snowflake; someone hypersensitive to insult or offense, especially a young person with politically correct sensibilities.
So someone easy offended? Needs political correctness to censor offensive speech or behaviors?
If that's what you are referring to, I think it can be formed from nature and nurture. Nature because, as some studies have shown, in homosexuality, there are certain differences biologically in some who are gay, that make them feel a certain way towards the two genders. I'm sure with more research you could pinpoint certain "genes" to portray people to feel a certain way.
Cross-Cultural Evidence for the Genetics of Homosexuality - Scientific American
Furthermore, in regards to nature, I think if you look a certain way, attributed to your DNA, such as race or prominent facial features, those biological differences may shape the way you see yourself and then how to act, from nurture aspects.
There are millions of different scenarios in why someone thinks the way they do, from a nurture standpoint, so that point is pretty obvious, in that of course a person's experiences form the way they think. ESPECIALLY in regards to thinking they are special and reasons they are offended.
Everyone gets offended at some point in their life, the important part is how they deal with it.