YANBU to find this throughly annoying.
But I do find it bizarre when people's friends/acquaintances feel moved to comment on their choice of childcare.
No-one I have ever met in real life has batted an eyelid at the fact that DS1 went to nursery FT at 6 months and DS2 will be going PT next week, at 8 months. Everyone just seems to accept it as an entirely normal progression - I only know one mum who hasn't returned to work after maternity leave, or who isn't doing some sort of work and using some sort of childcare, and I know people in all sorts of professions.
I am really happy with our decisions - DS1 has got a lot out of his time at nursery and I am confident that DS2 will also benefit. I'm not saying that every child needs to go to nursery, or even that every child will benefit, but for the DSs and their particular personalities (pretty full on, energetic and wanting to be doing stuff and engaging with people all the time) it is definitely the right choice.
I'm sure someone will say "poor your children" fairly soon, but they will be wasting their time, I'm afraid. When you know perfectly well you have, by luck or good management, got it right (for once!) criticism by people who don't know you or your children is, to quote a non-English speaking family friend who occasionally got his colloquialisms a bit wrong, "water up a duck's arse".
Ignore, OP. No-one is in a position to form an educated opinion about what is best for your family and your children, unless they live in that family unit on a daily basis. And if they did, you wouldn't need childcare!