Why all the insults about Queen Camilla's looks?

I get that people don't like her because she was the other woman and Diana was beloved, but why attack her looks?

I know she's not in Diana's league, but take a look at who she's married to. Charles is no supermodel and lucked out massively by getting a gorgeous bride like Diana the first time. And even then, that was basically an arranged marriage. Do people really think lightning is going to strike twice? If I was bisexual, I'd take Camilla over Charles in a heartbeat.

Plus, who knows what Diana would look like if she was still alive today? Looks fade, after all.

Princes Edward and Philip are/were no models either, and I don't see them being compared to horses. While that can partly be explained away by double standards with regards to males and females, Sarah Ferguson and Princess Eugenie are no beauties either, but all the bullying falls onto Camilla's appearance. Both Beatrice and Eugenie show up to royal events wearing absolutely ridiculous outfits and especially hats, but don't take half the ridicule that Camilla gets for simply existing.

Camilla is a perfectly respectable-looking sepruagenarian woman with keen fashion sense. Fergie at this point is no better looking than she is. Why all the attacks on her appearance?