Don't be fooled by Meech's public facing baby voice. According to children from the IBLP community who grew up with the army of Duggar children, Michelle is prone to screaming at the top of her lungs to her kids.
I doubt she does it to Rimjob, but remember she had an actual mental breakdown due to all the endless laundry at one point (when her daughter-slaves were too young to shoulder the task.) Jim Bob actually got her help in the form of convincing an older woman from a chuch they used to attened to do all of their laundry voluntarily (and to nanny, I suspect). That older woman was considered an honorary grandmother to the kids, and did all of their laundry until she died.
So Michelle is certainly capable of voicing her needs and anger, just so long as the public never sees it.