"I'm a guy using Linux" - Ok. "I'm a Linux guy" - Bad. This is very much an imprecise abstraction, more like a rule of thumb. Just be careful how you think of

"I'm a guy using Linux" - Ok. "I'm a Linux guy" - Bad. This is very much an imprecise abstraction, more like a rule of thumb. Just be careful how you think of yourself. "I ride bicycles" - Fine. "I'm a cyclist" - Getting weird. "I voted for X" - Ok. "I'm team X" - Dangerous.