Why do I find this a little disturbing?

I recently heard about experiments being done with culturing meat. Labs have grown meat cells. They haven't grown actual tissue, and it isn't anywhere near the marketing stage yet, but the idea is that some day, we can get meat without having to raise and kill animals for it. The possible benefits are many. We could have a lot more food while using a lot less land. More land could be used to grow grain, which feeds a lot more people. We wouldn't have to cut down the worlds rain forests for cattle to graze. We could not have to kill animals for meat. I can't even remember all the benefits. And the result wouldn't be synthetic meat. It would be real meat. Real animal muscle tissue. It just wouldn't have come from an animal that had lived that we had killed. So, why does this seem a little disturbing to me? I don't have any rational reason for my emotional reaction to it.