DD is 5, we had to get the bus this morning to do some errands (we don't drive) we got on at the terminal, and sat about halfway down the bus (single decker, a few rows behind the priority seats). The bus was quiet but soon started filling up a few stops into the route. By the time the 'incident' took place, all the pairs of seats had at least one occupant, but the majority were taken up by one person and a small bag. I had DD on one seat, me on the other and a few carrier bags at our feet.
Bus stops and two ladies get on, middle aged, I wouldn't say old, they walk past the priority seats to around where we were, looking for a vacant seat, talking to each other. They spot me and DD - and one says to the other, loudly, about children should be standing if the adults needed seats. They ignored the people who had handbags etc on the spare seat. I wasn't paying much attention, until one of them said to me directly that children shouldn't be sitting while adults were standing. I have raging PMT and said to her, politely, there were plenty of seats taken by small bags, could she please ask someone to move their bag, she scoffed and said that that was 'a bit different to children being on seats' and anyway, luggage couldn't be put in the aisle 
I wasn't up for the debate so pulled DD onto my lap and shoehorned us both into the window seat with the shopping bags under my knees. She did a rather sarcastic thank you and sat down, her friend sitting behind as someone had moved their bag. They continued to talk about the rudeness of children on seats and children in general and 'slack' parents not teaching manners......
Don't get me wrong, even though DD now pays to take the bus, if the bus is busy and there are only a couple of seats free I do put her on my knee - I can't get her to stand on a moving bus as she has hypermobility and poor balance - walking to get off the bus when it's moving is a challenge on its own. But there were loads of free seats just with small handbags (not big hold alls or suitcases) on, surely a child has more entitlement to a seat than a bag? Was I in the wrong here?