In this section, there can be a fine line between pointing out mistakes or errors and just being rude.
There is never any call to flat out insult someone's work. It takes a lot of guts to post your writing online and people should not be discouraged from doing so by insults. Always make sure that whenever you point out the flaws in someone's work you do so with a mind to helping them improve and do so in as friendly a manner as possible. If your remarks are unnecessarily rude, their helpfulness will inevitably be eclipsed by the hurt that they cause.
Additionally, if someone says they don't want any negative feedback, that is their choice. It is not up to you to say that they should take it because that is the only way they can improve.
If you feel that someone has been too mean in their review, whether that be about your work or with comments directed personally at you, please report it. (To do this, click the little triangle with an exclamation mark inside it near the bottom of the post.) If you're not sure if your complaint is legitimate, it's still alright to report it. It's not always possible for the Writer's Workshop to read every single reply so it is important that if you think someone has stepped out of line you do report it.
Thanks for your help and I hope you all continue to enjoy your time in the Workshop! :)