Ok I won't go into great detail as it will out me but...
DH, DD, DS and I went to a friends house, DD made a mess of toys (as did their DD) so I tidied it all up before we left.
They then came to our house, their DD made a mess of our house (as did our DD) but they left without even an offer of help.
AIBU to be cross and expect help tidying? DH said they might have thought my tidying their house was a criticism of their housekeeping. If they did see it like that it certainly wasn't meant to be, my DD had made a mess so I tidied the toys away (it wasn't like I had gone round wiping my fingers in the dust and got the polish out or anything).