Being radicalized by the Internet isn't an excuse for teenage Isis fighters, nor is it one for a 55 year old man.
However, there is much wisdom in McLuhan's "we become what we behold" -- and consuming too much "social media" turns one into a performative puppet. Twitter is the distilled version of this (Jaron Lanier called it "Twitter Poisoning").
If Elon Husk huffing Twitter 24/7 while owning Twitter isn't a case of "getting high on your own supply", then I don't know what is.