Well, I can understand you feeling puzzled and being irritated that he didn't use the options that were obvious to you. Nothing wrong with being annoyed, after all we have a lengthy "Dear So-and-so"-thread dedicated to ranting about stuff that bugs us. And you certainly could have pointed it out to him, but it sounds like you don't like the guy much so maybe casual conversation is out.
But you're rather strongly implying that he "should" have known about and used other forms of transit, and it's not a question of "should". He didn't know, or didn't want to use it for whatever reason, and unless it affects you personally you're not really entitled to an opinion apart from a casual comment. People make rational and irrational decisions all the time and that's free will.
Every winter I will overhear some colleague who drives to work going on about some cyclist who "shouldn't have been out there" as if it were a moral imperative, because they saw a cyclist struggling in the snow, without knowing anything at all about why this person chose to cycle. Emotional ranting is one thing, but seriously discussing that someone should be doing this or that gets my hackles up. (They usually shut up when they see me coming though
)
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett