People who already have 1 or more children complain about ttc?

I've seen people write really rude things such as "just be happy you already have one" or "you should be enjoying the kids you have"

People who have kids already obviously do enjoy and appreciate their kids and so they would like to experience having more.

When you are trying to conceive a bfn is dissappointing whether you are trying for #1 or #5 imo.

Some people respond as if, if you aren't trying for #1 you shouldn't be upset.