Edgelord
An edgelord is someone, typically on the Internet, who tries to impress or shock by posting exaggerated opinions such as nihilism or extremist views. The term is a portmanteau derived from "edgy" and "shitlord" – a person who "basks in the bitterness and misery of others". According to Merriam-Webster Dictionary, the first known usage with this meaning was in 2015. It was added to Webster's in September 2023. Webster gave the following example: 

Edgelords were characterised by author Rachel Monroe in her account of criminal behaviour, Savage Appetites:

It is frequently associated with the forum site 4chan. The renegade rhetoric of the edgelord is often intentionally employed by the far right to troll leftist targets. See also

 Épater la bourgeoisie
 Schadenfreude
 Shock jock
 Shock site

References

 Internet terminology
 Pejorative terms for people