Agreed, that was an ignorant post.
Something akin to this happens in Boston every year, though the attendees, rather than medical marijuana consumers, are the people that our holier-than-thou friend was goodly enough to refer to as "low lifes" and "perennial losers" (because that just sounds so much more thoughtful than just "loser!")
The Boston Common will load up with people who hang out and smoke, there's a stage erected with speakers advocating decriminalization and legalization of marijuana, and the Boston Common will spend the day "smelling funny."
What boggles my mind though, is that police officers will stay stationed outside this public park on foot and on horseback and wait until something like 4:00, just watching people smoke. Then, at that time, they'll enter and start patrolling the park, telling people to snuff out their joints or go home. Weird.