Millennials are people born between 1982 and 2004, who are also called "Generation Y" because they follow "Generation X" in age.
Millennials are most associated with heavy use of the internet, electronic technology, and social media. For reasons that can be debated, millennials tend to be more pro-life and more supportive of the Second Amendment than older generations.
A snowflake is a (usually excessively spoiled) millennial who acts like a child despite being a grown adult. Snowflakes are known for constant complaining and literally crying when things don't go their way. They are infamous for engaging in violent protests involving the burning of innocent businesses, government buildings, police cars, American flags, and sometimes even their own universities. They are also infamous for Students Against Sweatshops, an organization that complains about illegal aliens not being paid enough and on-campus privatization of services. Ironically, SAS has been known to pressure college administrators to "kick out Sodexo" (or ARAMARK, Chartwells, etc.) in support of the employees of those companies who may lose all of their benefits or even be laid-off if SAS is successful.