I think his reasoning is that since many people on this comment section who oppose the public use of marijuana are using a false argument - "tobacco is not legal in public therefore marijuana shouldn't be either" - then they don't actually have a brain. Or at least they are not using it very well. Which is ironic because people who don't like marijuana often accuse people who smoke marijuana of not having a brain. The commentator he was responding to is one of the few to correctly note that yes cigarettes are still legal is most public places and it isn't unreasonable to ask for marijuana to be given the same privileges. So yes someone can reasonably intelligent and disagree but in order to do so they have to use an argument that is both intelligent and reasonable aka logical.