For one, it's a text based medium. I find it unlikely that people can express their racism and misogyny when people are primarily identified by username and an abstract icon. But OK, all answers and questions are written in a context, and generalisations might be made that might be detectable. But truly "offended"? I think not.
There is a tension between being a tool for professionals or a helping community for beginners - and yes, the balance was initially very skewed, but not so much any more.
I also find the writing style with terse questions in FAQ-style (no K TXH BYE) kind of refreshing, actually.