I can tell that you are new. There are threads and threads about this.
From a teacher's point of view, in my school, vacations are not excused absences. Two unexcused absences require a call to the parent. Parent needs to send in note explaining the reason for absence, i.e., illness (doctor's note preferred), funeral, other emergency. Our district only allows up to 9 days of parent notes, after that, all absences require a doctor's note. We have quite an intensive protocol including phones calls, notes, truancy officer visits, and finally the call to the Department of Children and Families, my favorite.
All of these unexcused absences take a lot of time to make contact with the parent and document on Power Teacher. All notes and documentation are considered legal documents and can be used in court, so we need to keep our ducks in a row. I find most of this to be a colossal waste of my time, but just like I'm a mandated reporter, I have no choice. Parents get mad and push back. It can get very ugly.
The simple solution is for the child to only be absent when they are actually ill. I chose to use the school vacations to travel, and we have many choices: Christmas break, February break, April break, and the most flexible of them all, summer.
I have students who have only been out two days with stomach viruses already, and I have spent quite a bit of time on documentation, because none of them had doctor's notes. I understand. I didn't go to the doctor in August when I got a stomach bug.
So, there you have it. If teachers are a bit crabby, it is because extra work has been created for them due to your child's unexcused absence. If you asked for a work packet filled with assignments to complete so that your child wouldn't fall behind, that only adds to the bad mood. By the way, every day that a child misses class, they are missing a lot just by not being present and experiencing learning first-hand in person. No amount of worksheets can make up for being taught by the teacher in that moment.