Authenticity is being true to oneself with integrity, openness, and non-judgmental values, while snobbery is a belief in one's own superiority based on superficial traits like status or taste, leading to disdain for others. The key difference is that authenticity emphasizes genuine self-expression and acceptance of others, whereas snobbery involves judgment, a need for special treatment, and a dismissive attitude toward those perceived as different or inferior.

 What authenticity looks like.

Snobbery, said Joseph Epstein, "is the desire for what divides men and the inability to value what unites them."  source