DS12 came home today, telling me a bird had poo'd on him. On his shoes and jumper. Had a laugh, etc. I cleaned the shoes and told him to give me his jumper so I could wash it and he's to get a clean one out for school tomorrow to take when he goes over to his dads later.
So the washing cycle has finished. He's leaving for his dads, and I remind him to get a clean jumper. "Oh, it went on my trousers too", he tells me. 
I've now told him he'll need to come back here in the morning to get ready for school. (Same street):
1. To teach him to use his brain and think for himself. Why not mention the trousers when he mentioned the shoes and jumper?
2. Ex dp has yet to buy any school uniform this year (despite telling DS he would) and I'm sick of handing a set over when DS needs a clean one in circumstances such as this. (Ex just lets him wear the same one two days on the trot on days when we haven't had bird shit incidents or similar)
AIBU in using this to get a point across to both of them that there is no washing fairy or free school uniform fairy, even though it will only really inconvenience DS? I think I am really, but I was already annoyed by his moaning about plans we have tomorrow and his ignoring me telling him to get to his dads for dinner.