But doesn't calling Sarvis a douche bag draw the attention of the reader to something sexual in nature? Something demeaning to women?

At least a pussy or the "s" word (or the "r" word for that matter) connotes a warm, living entity. "Douche bag" is a cold inanimate and as such dehumanizing object.

A douche bag rinses a vagina. What could possibly be more degrading to all women than calling a person some slang on vagina?

Answer: Calling him something that cleans out a vagina.

I wonder if this latest bout of misandry is, as dave says, a case of you

caught out being [their] embarrassing self

Did you goof when calling him a douche bag? Did you really mean that "dickblister" (demeaning to all men by the way) is acceptable?

Can we confidently say at this time due to your sexist attitudes behind your crusader facade. . .

"Dawn, we hardly knew ye?"