The kind of behavior in the OP is unacceptable.

As to those saying for people to get a thicker skin and using the sticks and stones rhyme, it does help as most of the time people like that are seeking attention, however ignoring a problem does not usually solve it, eventually run into one that needs action taken. Two other sayings that are appropriate here are "All it takes for evil to triumph is for good men to do nothing" and "It takes a village to raise a child". I hope the meaning of the first one is rather self explanatory, the second one is not so much every one has to take time to raise the child, but the child learns from everyone around them. So in the context of bullying, yes kids need to learn how to deal with it themselves, but think on how they learn to do it?

While that behavior is not the current normal for the DF system, the longer nothing is done about it, the more widespread and accepted it will become.

It's not that some of us can not handle that kind of language, it's more that we do not want it to become the normal accepted behavior.