shaming celebrities kids

Abby
I understand that some people hate the Kardashians and Beyoncé I get that you don't have to like them, but leave the kids alone I just don't understand how somebody can say blue ivy is ugly and bash her and say she's gunna be the ugly duckling if her brother or sisters are pretty 
And with north she seems to get bashed so hard I've seen people comment on pics of her saying she's gunna be a whore just like her mother or when's her sex tape gunna come out like wtf these people are adults and almost ready to see these kids naked like that sounds a little pedo to me. I thought kids were off limits ? 
How would people like it if they made the same comments about thier kids? I bet they would be pissed