It's never acceptable. I'd make a complaint to the local UPS dispatching center. Give the time of delivery and your location and they'll know who it was. I'm always amazed at the complaints about UPS and FedEx delivery people I see on this message board. Both delivery guys in my neighborhood are great. They're friendly, don't just leave a package unless I'm truly not home, and help put heavy packages at least in the foyer of the house. I've just never had issues with them at all and we get deliveries all the time because we're all about online shopping.