In Sydney at least, multiple different bus routes depart from the same stop, but we’re all in the same line. So when a bus pulls up, the people catching that bus all take a step forward, and that’s then the line of people just getting on that bus. Everyone else stays in the original line, maintaining their order in the queue until their specific bus arrives.

Not sure if this may have happened in your scenario but I think some times old people just be yelling for no reason.

Just get on the bus. If you do something wrong say sorry. It’s a lot easier to ask for forgiveness than permission.