If i wanted to sell my washing machine but was away on holiday...

If i wanted to sell my washing machine but was away on holiday and had my uncle sell it for me, Would it be 'childish' of me to kick up a stink for him telling me the i would have my money by Saturday as he has lined up a buyer, for it to fall through? Or would an adult have the capacity to understand my uncle is not at fault for a buyer wanting to cancel on their arranged agreement, as this is an external factor not under his control?

Not looking to argue but everyone painting DT as the bad guy really have no idea whats involved in creating something of this scale.