I'm just saying, after this haircut, it's difficult to trust you.
A joke about precision with sharp objects. Here, the archer apparently gave this person their haircut, and they think it's ugly. They are planning to shoot an apple off the other person's head, which requires deft coordination with a sharp object, i.e., the arrow. But the person with the haircut doesn't trust their capacity with sharp objects, because the scissors used to cut their hair weren't used skillfully, as the haircut turned out ugly.