Not disagreeing with your stated belief, but I believe most people in the linux community do associate proprietary software with maliciousness.
Most Linux users might not buy into a boycott of Ubuntu -- in that sense they reject RMS's ideology.
But I think few would argue that proprietary software does tend towards bullshit -- the very DRM and the like that RMS is calling malicious. They might not go around calling it malicious, but they wouldn't consider RMS's attitude there extreme, just the actions he advocates.
And malicious has strong connotations..e.g malware, spyware, which most "linux users" wouldn't necessarily apply to developers of legit proprietary software.