To ask what you would think of this?

[HazelNutHotChocolate]

Looked after friends kids for the week. This morning I was left outside because nobody was answering the door. Eventually, the 9 yr old answered it but did not acknowledge me and walked into another room, locking herself in there. She was angry about something unrelated to me but friend (her dad) saw it all and did not tell her to apologise to me.
Eldest also ignored me after school for a while. Both kids complained about walking and again, eldest walked back deliberately slowly whilst I was carrying a heavy bag.
Throughout the afternoon, both kids had arguments with each other and regularly went off to sulk.
Friend picked us up from their tennis club and just dropped me off right outside their house without asking how things had gone or even letting me in.
Aibu to be pissed off and to say they can whistle for anymore help?

Why are you doing this? They can pay for childcare like everyone else. Let them get on with it themselves.

Yup. I'd leave them to get on with it. No way would I allow myself to get treated so badly and be taken advantage of. Can you text them now so you don't have to do it tomorrow? (Assuming it's not too late for them to find alternative plans.). Otherwise I'd definitely cancel for next week now. How long is this arrangement for?

I've cancelled tomorrow.
The lack of respect from all of them was appalling and yet they didn't think anything of it. I've seen their true colours now and how they view me and it is not a nice realisation.

Glad to hear it. Well done.

How long have you looked after their children?

Well done for cancelling. They're v rude and you deserve better than to be treated like that