Although the remark about bragging suggests that this guy is unaware of the existence of other standards, which is something he can be legitimately mocked for.
It was an attempt to be polite because he was expressing extreme happiness for himself and that can be taken as selfish in this type of social interaction.
Someone else being happy with their life isn’t a condemnation on yours.
Four kids and a husband sounds like a nightmare to me as well, but the father clearly is happy about it. And that’s ok.
Although the remark about bragging suggests that this guy is unaware of the existence of other standards, which is something he can be legitimately mocked for.
It was an attempt to be polite because he was expressing extreme happiness for himself and that can be taken as selfish in this type of social interaction.