Well, the OP is a parody of the thread asking why some women don’t like oral, and IMHO that’s a fairly stupid question to ask. The answer is absurdly simple: because they don’t like it. Nobody goes around asking men why they don’t like water sports or women why they don’t like copraphagia. Oral is a helluva lot more common than any of those kinks, but it’s still just one of many, many possible sexual acts.
I can’t really know what Kimmy Gibler was thinking, but I’m guessing that he/she was bugged by this assumption that a woman is obligated to perform oral even if she doesn’t like it, and if she doesn’t then something is clearly wrong and she needs to have an excuse (TMJ, coming from an older generation where oral was seen as super skanky, etc). Many people are pointing out that many men just aren’t wired to want a dick/dildo in their ass, but everyone takes it for granted that women should want a dick in the mouth? The analogy holds.
Just my $.02.