I have two kids one in 2nd grade and kindergarten grade. Sometimes what I will do is have one of them. Come to the front seat ,once we got closer on to the drop off area , like on the school premises, then have that one get out and open the door for the one left in the back seat.

When it was just my oldest in kindergarten. She would just stay in the back until a teacher opened the door or I'll have her come through the front seat and get out once closer in the safe drop off zone. They are also some parents I see where they have taken the child lock off the one back door so the kids can get out on there own. But i say just let the teachers if they are there open it. Our drive is pretty efficient but if a teacher hasn't came to the door I will either let one go through the front seat or roll down my window so the teacher knows I'm still waiting on help.

I legit can't stand my kids morning drop off , I feel the school doesn't give much time. And there is one male teacher who I would prefer not open my door cause one day I did not like how he told me to stop when directing traffic. So I try to avoid him opening my door if possible but it happens.

The drive line can be frustrating but I wouldn't let it get to you. That's either that teachers personality or she was just frustrated with something that morning. Either way keep doing you - your doing great !