Boyfriend issues

So I been with my boyfriend for almost 2 years and he has no kids and I’ve let his complaints about my 29 year old daughter that lives with me and hasn’t worked in a year slide and his complaints about my 15 year old also slide but at this point I’m over it. Before we decided to move in together I told him what he was signing up for and now it’s complaint after complaint and I already told him that the door is always open for him to leave. He went as far as telling me that my parenting skills suck. Mind you I have raised 5 children ages 32,29,28,25 and 15. Don’t know what to do as this point. I love him but how can I make him understand that he cannot expect for me not to react when he speaks down about my kids. And to make matters worse he’s a mommas boy