If you have enough time on your hands to comment then you have the same amount of time as the OP did to worry about the issue in the first place. It's not lack of time that is your problem, it's inability or reluctance to comprehend.
I don't know how strongly I can object to the Little Miss books - and I love The Tiger Who Came To Tea, partly because in my head Mummy has just gone 'fuck it', eaten all the cake and drunk daddy's beer herself and rather than objecting, he cheerily takes them all out for a nice dinner because he appreciates how hard his wife works and maybe it was her day off anyway and tomorrow she will go into work being a captain of industry whilst he looks after Sophie.
So yes, I have FAR too much time on my hands.
My toddler loves the Mr Men/Little Miss books and I've never thought of them as especially damaging but there is an inescapable sexism seeping through somewhere because particularly since starting pre-school he is frequently coming out with 'such and such is for girls', 'girls like fairies, boys like superheroes' etc and when I've been into his nursery for stay and play sessions, the boys do play much more active and exciting games whilst the girls do a lot of mundane domestic type playing. There is too much gender segregation in toys and I guess that the smaller messages do stack up to a cumulative effect. So on balance, I suppose the OP is NBU but I think there are much worse culprits (Lego Friends, I am giving you a cold, hard stare).
And to the pp who was scathing about Hargreaves Jr writing the books for the money - erm, isn't that sort of the point of most jobs?