BeenBeta wrote - "I was told that all I could be was sympathetic and to shut up and listen."
Really? I think you are paraphrasing rather than quoting, but you are entitled to read whatever you like into what has or hasn't been written. To cry foul over things that weren't said to you by feminists is not very constructive.
Many of the reasons for male - female misunderstanding causing men to be offended by feminists don't seem to apply to the women who are also offended.
Not all the men who post in the Feminism section reveal that they are male. They would therefore not be attacked for "being a man".
I think any harsh words handed out to the offended men and women are mainly due to the perceived anti-feminist content of the post. As there is no single feminist viewpoint (such as the non-existent Mumsnet feminist party line), there are also multiple ways a statement can be anti-feminist. Any feminist is entitled to regard the opinion of another poster as anti-feminist, when a post does not fit with their own feminist beliefs. Problems arise when the offended person mistakenly believes that they have been branded "anti-feminist" or "misogynist" by the entire feminist movement. Sometimes, there is an element of deliberately looking for offence and then using it to dramatically disengage from the debate.
The one or two feminists in the Feminism section who label others as "anti-feminist" on a regular basis are very consistent and predictable in their behaviour. What really surprises me is how consistent and predictable the behaviour of the offended party turns out to be. It's like they're acting out a pre-defined script. I would expect much, much more natural variation in their reactions.