Not entirely on topic, but talk of washing-up reminded me that the first Christmas I was living with my now DH, we invited his ex and family for Christmas dinner so that DSD, who was quite little at the time, could have all her 'people' together so to speak. Unfortunately DSD's mum was in a phase of being a bit of an arse to me at the time (I wasn't the OW, she and DH had split amicably years before, and I can genuinely say I'd done nothing to provoke her attitude), and after the meal was over she engaged in passive-aggressive washing-up, i.e. standing at the sink doing it and literally pretending not to hear me say that there was no need to do it and to go and sit down and relax and I'd bring her a drink.
The performative washing-up wasn't intended to help at all, it was supposed to put me in my 'place' - I'd just moved into the house she'd formerly shared with DH, which is never ideal, but she seemed to think she had some sort of indefinable superiority over me as a result. Territorial washing-up, if you will. 😂(Thankfully for everyone concerned, things improved over time.)