The whole "ugh some people are offended by EVERYTHING" is so hypocritical and dangerous. This has nothing to do with being "offended" it has to do with the active dangers created when a culture of sexualising young girls is normalised.
"The Family Sex Show" was extremely and actively dangerous and could have been directly used as a grooming tool by pedophiles (and I put my own career on the line and lost jobs from speaking out against it irl).
Kate Clanchy's book obviously is not on a par with TFSS but it does still normalise sexualisation of young girls.
The difference in how posters in Feminist Chat have treated the two proves that it's nothing to do with free speech and everything to do with ideology. Kate Clanchy has weaponised "anti-wokeness" and pretended that she's a victim of cancel culture, so people who are ideologically opposed to "wokeness" feel honour bound to support her.
I simply don't believe for a second that if a black author wrote the same things Kate wrote about white people, or a trans author wrote the same comments Kate did about young girls' bodies, that Mumsnet would be full of posters defending them and defending their right to free speech and sneering about people being offended by everything.
It was Kate Clanchy's decision to profit from a scandal she herself created. No one forced her to sign a new deal with a new publisher, or re-release her book. She hasn't been cancelled or censored. No one forced her to try to get ordinary readers cancelled. If you don't like negative reviews, just don't read them!