That sounds exactly like something my mom would say. 0.0
There will be bickering, but it won't matter after a little while. Also, don't forget about banter. Steelborn and I trash talk each other on a regular basis, but I'd consider him to be my best friend. Brothers will still pick on each other and the youngest child will still throw tantrums, but after an hour or so, they'll go back to playing together.
When a parent gets yells in my family, its almost always for one of these three reasons: 1. The kids refuse to do what the parent asks (get ready for bed, help clean the kitchen, etc.), a kid is throwing a fit and the parent has had enough, or the kids are bickering again and the parent has had enough. Parents still have bad days and does get mad at their children over something that doesn't matter very much, but the difference is that afterwards the parent apologizes for snapping at them and one of the kids tells them it's fine or apologizes in return. They share a hug and go on with their day. Because in the end, silly disagreements don't matter. What matters is that they love each other.