how many kids?!

Becca • S I X BOYS, ages 16, 14, 10, 6 and forever 2 months he’s a heart warrior angel, then our double rainbow boy, he’s almost 2! I’ve had a miscarriage of twins in sept 2024 and we’re trying for our rainbow!
My husband and I have three beautiful boys, ages 8,7, and 2.5..
I told my hubby I wanted to be done having kids by 30 because by age 50, I wanna be able to travel freely with no children in the home.
We have gotten some backlash for having 3, (aren't you done yet, you've got three boys, why are you trying for a girl.. you know you're going to have another boy... etc) 
I come from a family of 18(birth family and adopted) and he comes from a family of 7... 
So I don't understand the trepidation of them saying such things to us. 
What would you say to them, to kindly tell them that what we do with out body parts is our own business, and my hubby makes enough money to support 10 kids if we really wanted too, he makes over (100,000) a year. 
Just feeling... like I kindly want to say "f off"