The sort the speaker is used to. People from the bsdophilic academic community are likely to issue comments like "system v? Why don't you use a *real* operating system?", people from the commercial/industrial unix sector are known to complain "BSD? Why don't you use a *real* operating system?", and people from ibm object "Unix? Why don't you use a *real* operating system?"

See holy wars, religious issues, proprietary, get a real computer!.

[jargon file]