I don't think it's fair to publicly show off and simultaneously lightly insult other people (the original post, unless it's ironic and I'm missing the joke, is trying to make such a point) but then not expect any sort of a response. These aren't people just minding their business. These appear to be extremely over confident people who crave public attention, and they (or their friends) are willing to put others down in the process.

I don't think they need to be defended.