"Post-PC" refers to the era after it was considered good etiquette to be politically correct. The abbreviation "PC" means "politically correct" and it refers to language that tries minimize offensive remarks about someone's gender, race, disability, or other form of identity. This spawned the term "politically incorrect" (unPC) which refers to language or ideas that cause offense to someone.
The term "post-PC" means it is now considered okay to say racial epithets, for example, freely because in the online world it is harder to determine what is acceptable lingo. The online generation, specifically YouTubers, tend to say almost whatever they want about anyone without much fuss. An example is when Price Harry of England was videotaped calling a fellow student a "Paki" because "everyone says Paki with or without irony."
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NetLingo Classification: Online Jargon