Only way to do that is to not respond when you are frazzled, feeling unnatural, or feeling rushed.
It's ok. Your friends get that social media put huge demands on people who produce anything of value. We don't expect you to feel obligated to "take care" of us or our feelings. The people who don't get that aren't worth worrying about.
Good people don't put overwhelming demands on other good people Period.
Take a deep breath. Take several. Take a few or many minutes to meditate or do whatever works for you to calm you down & feel less frazzled. If while you're doing that something pops up in your head that you think will do the trick, write it. If not, go do other things you need to do and fuggeddaboudit.
Your healing and your kid's are far more important than any of your readers/commenters. And please, don't assume that you have to respond to any of us immediately after you read. Let it settle. It is truly ok if you don't have a reply right away. It's also ok if you get caught up in other things and can't get back to us.
Your friends will want the best for you. The rest, well...if they don't want the best for you then they must want the best only for themselves. And those people don't deserve a single letter of the alphabet from you!