Instructors like that are the worst. For better or worse, the most influential professor I ever had was a hardcore Unix guy with hella experience (worked for IBM back in the day along with other stuff) as a low-level programmer. He was incredibly meticulous, and I had to adapt. All professors I've had since then, no matter the course/subject, have hated me because of the attention to detail and logic I show in class.
Er... I digress. I love Linux... a lot.
And I'm thinking a post-workout shower is in order.