I thought I was blind or something since I also can't find those comments
Whenever they try something new, people will come out of the woodwork to "hate" on this. It is mostly just them being icky about the play they do.
It happened with the newest chapter because baby expressed interest in doing non con play. And some people didn't like the scene and ahjussi calling him "son" even when their "son-daddy" play has been well established by now.
They are, however, in the minority and quickly drowned in the sea of positive comment, because this is a BDSM story, and a great one at that.
No there were some hate comments in previous chapter...
Every single comment: why are people mad this is consensual? why is everyone hating
Hate comments: