Why does some (pseudonymous, or even anonymous?) Twitter account claim to speak for some "silent majority"? Even using the term "we". Who is "we"? And why they

Why does some (pseudonymous, or even anonymous?) Twitter account claim to speak for some "silent majority"? Even using the term "we". Who is "we"? And why they think they are a majority? Was there a poll or so? Did I miss out something? Such kind of framing makes me angry — no matter I agree or not on the actual point! Who the fuck thinks they can speak on my behalf without even trying to ask me about my opinions?