I think there may be an element of deindividuation and herd mentality at play.
We have a bunch of very good, nice, caring, kind, funny, knowledgeable, helpful, and empathetic people over here. The DDF community never ceases to impress. I'm not exaggerating when I say that I think it's one of the highest quality online forums in the frum community (from the limited forums I've seen), in terms of the intellectual value, the writing quality, the intelligent give and take, the knowledgeability of the user base, the refreshing dichotomy of hashkafic solidness while simultaneously respecting the rich diversity that exists here, and more. There's a lot of to proud of.
However, this seems to be one of our weak points. When someone calls someone out for saying something they don't think is wise (particularly if it's a new member), we sometimes all jump on the bandwagon to get in on the fun in trying to outdo each other in getting in the wittiest line and the sharpest retort to put to person in their place.
It happens everywhere in the world, and is endemic to the human condition. However, as such a high quality forum that prides ourselves on being a welcoming environment, and a community comprised primarily of a religious demographic that has a strong focus of kindness and interpersonal sensitivity, I think we need to hold ourselves to a higher standard.
It's very easy to lose sight when it happens, and feels so innocent, and I'm not accusing anyone of anything. I just think it's something we should remain hyper cognizant of. Staying away from letting things get personal, and attempting to keep discussion productive, makes this forum a better place and resource for everyone.
Sorry for the rant. I'll get off soapbox now.