Wee bit of context before I start: DP has two DDs aged 11 and 9. He has a lot of residual guilt over leaving them/their mum back when they were little (years before we met) and consequently he lets his youngest daughter in particular get away with an awful lot that he shouldn't imo.
We've been dating for two years and don't live together.
He's on his way to drop them back to their mums, when I don't have my DC and am free I usually go along to keep him company (hour drive each way) so agreed to again this time.
He turned up to pick me up with his DD2 in the front seat. As I approached the car he told me I was in the back. I asked if I could sit in the front. He said she wanted to sit in the front. I told him in that case to go ahead without me then as I'm an adult and not a child so he could pick me up on the way back if he wanted instead and went back in the house. No big row or a scene of anything. I just wasn't willing, as a grown adult, to sit in the back while a 9 year old sits in the front. I would never dream of doing the same to him with my DC.
AIBU to think that adults get priority over children in terms of sitting in the front of the car? It's just basic manners imo.
Or is that horrendously old-fashioned of me and I've been a rampant cow?