gotta sell the idea of FreeBSD a bit better than that. Otherwise, you just come across as a FreeBSD fanboi who doesn't care what others think, and just chants. 'FreeBSD is the greatest, FreeBSD is the greatest, FreeBSD is the greatest! Try it!'. Figure out what their difficulty is with getting stuff to run on Pi, and show them how FreeBSD does the same thing so much better. If you look at comments people make about what prompts them to move to FreeBSD from Linux - the reasons vary by the person.
Excuse me? I stated what their reasons were and their objections. I cannot be clearer, I would have thought. ?
(Though I never mentioned this, I suggested FreeBSD purely because he wanted to try headless computing where they installed putty on their laptops, connected to the PI via SSH and ran commands as a user; giving them concepts of multi-user systems etc).
Anyway, this is just two examples I have of coming up against established bias.