Unclean flatmate

Literally keeps leaving the sink occupied with dishes days at a time. There’s 5 of us altogether, we all share a kitchen. This individual identifies as non binary. The rest of us are girls. I’ve noticed none of the girls say anything and I’m just copying to blend in but it’s really starting to irritate me and they use the hook “I have ADHD” to come in as clutch And they keep apologising but not doing anything about it. 😠 it’s come to the point where you can’t use the sink or you have to move everything out of the sink. Should I start being passive? I.e. not saying hello anymore and ignoring them?

I am neurodivergent, and I have another flatmate who is autistic. ADHD does not excuse your poor behaviour and laziness.