School busses pulling into apartment complexes

This morning, I'm pulling up to my gate to leave my apartment complex. As it's opening I see a school bus parked in front of the gate. It usually picks kids up on the street. When the gate opens and I'm pulling through the bus flares up it's stop sign and lights. I look around and no kids are anywhere near. The bus driver is stepping out of the bus. I have to be at work. I don't have time for whatever is happening there. I don't even know if it's legal for school buses to pull into a complex. So I pass it. A constable is 20 ft further down right at entrance and storms at me. I roll the window down and he says do you know what you did? I said yes I passed the stop sign. He asked why. I said I didn't know what to do it was right at the gate entrance. He yelled your testing my patience, go. So I didn't get a ticket. What am I supposed to do? Stop right at the middle of the gate, wait for that bus driver to do whatever he's doing for possibly 5-10 minutes, and then proceed after that? School bus shouldn't be in complex. It causes too much confusion. People are aware of road rules.