False. Unfortunately, this (and similarly ignorant snap judgments I've seen and heard) is yet another example of why companies fail at hiring.
The latter does feel unprofessional at times for me only because it reminds me of my technological self outside of work context. But as soon as I make that connection I feel more in control of what i am doing, because my environment is there to back it up that yes, this is the same place where I had late-night hacking sessions and etc, this is where I initially got to know my skills and interest before work was even a factor. I feel because of that, I am able to produce more "genuine" work at times.
I guess everyone is different. Companies definitely should not put desirable remote work styles into 1 box, that's for sure.