Funny how you say that, given that I've never seen Slack users display the type of attitude you described. Same goes for *BSD users.

Rather, most "Linux supremacists" or however you call them I've seen tend to be Arch users, and vigorously promote Arch. Many of them have never tried a flavor of BSD or any other UNIX (such as Plan 9) either and barely even mention it.

Disclaimer: I'm a Slackware user. Although I don't like Ubuntu, it's good to see institutions making the shift. Besides, they need an easy-to-use desktop distribution, they're obviously not going to expect their workers to have a terminal emulator open 24/7.