He did change his behavior! He unfollowed/reported harassers and eventually rejected all new followers by taking his accounts private. And then the harassment came via other avenues!
What more are you expecting him to have done? And why wasn't it OK for him to try remaining open to possibly-friendly strangers for as long as possible? And he's not "screaming" or indeed complaining about anything, he's just describing a chain of events.
He's condensed around 3 years of on-and-off-again harassment and on-and-off-again countermeasures into a few paragraphs. You can either read it charitably, and assume other consistent and reasonable details for things unsaid, or read it in a hostile and suspicious manner (as '@ResistRadio' has).