I took a quick look at the thread, and decided that posting would really be a waste of time. Too bad they're so ignorant.
Another thing I noticed was a huge lack of respect. I have never heard another martial art badmouthed in my aikido classes, actually quite the opposite.
I don't know what may be taught in judo, but I would hope that they don't actively denigrate other martial arts.
I can't change another person's behavior, I can only change how I react to them, and in this case, they're better ignored, I guess.