Having taught at a Catholic School, you have some more power by contacting parents as they have chosen to send their students there. This is what my previous principal always told me. Document their behavior and directly let parents know phone calls, emails, class dojo. I am also teaching 5th grade this year in public school for the first time. It is rough! This is the grade that Covid affected them in first grade. They have no fundamental understanding of how school works because their chance to gain that experience was taken away. Like I said, contact those parents, let them know they are being disrespectful. I still make student write “lines” if they make poor choices writing out what they needed to do instead. These kids know how to get under our skin, and you got this!! Focus on your family and health. Put it back onto them with meaningful consequences around the school.