There’s lots of misrepresentation here by you and other posters.
Saying that he interrupts about trivial stuff
The issue isn’t with DS talking about trivial stuff, it’s that he doesn’t talk to DH about these things when DH is not talking to OP. DS interferes specifically when OP is talking to her DH. So there is jealousy here which needs to be addressed by DH being more present for his son, not by allowing DS to interrupt OP with talk about Horrid Henry because DH likes being in demand.
and then getting a weird notion about “being the nanny” and that she has to be silent until the children are in bed to have a proper interrupted chat. It’s just bizarre to me.
The nanny comment was in response to people patronisingly telling OP that all her DH wants to do is spend time with his son and OP should let him. When clearly that’s not the case because the DH prefers to be on his phone or TV.
Yes, the DS shouldn’t interrupt but the issue here is that he’s clearly desperate for some time and attention from his dad. So DH needs to come home and do that - spend time with his kids. His phone, and conversations about chores, can wait.
You’re preaching to the converted, I have already made this point upthread. What are you adding here?
OP is an adult who doesn’t need immediate, undivided time with her DH every day after work. She can text him during the day, wait until the children are in bed etc. Her 9yo doesn’t have that - he has a tiny window between dad getting home and bedtime.
Op is a human being who is being dismissed from conversations because her DH prefers for Op to be interrupted rather than for him to spend time with his son.