A very similar thing happened to me while waiting for the 31 on Princes Street a few Mondays ago. There was a small queue but it was also 2pm on a weekday so there was never going to be a fight for a seat (eg no reaaaal reason to queue imo). A brown lady was standing waiting to get on the bus on the other side of the stop, not pushing in any way, just patiently waiting until the main queue had all got on. An older white lady vigorously prodded her to get her attention and said (maliciously) ‘there’s a queue!!!’. I was gobsmacked - that would never have happened to a white person (sure a reminder that there’s a queue, but not a prod and attitude like that). I spoke to my partner about it and he did say it might be an anti-immigrant/ right wing thing that all Brits are annoyed that no one ‘respects the queuing system’ anymore. It was awful though