I might be in the minority here, but as long as you sit still, even after getting busted, they tend to go away. No bothers. I hunt a three acre field of alfalfa dead smack in the middle of 500 acres of timber, and I have witnessed several dozens of deer at one time while squirrels where chattering and barking in the timber. This goes on enough in the wild that I don't think deer pay significant attention to this. They may to a short degree, but not much. I have seen more reaction from deer when bluejays or turkeys get to making noise more than I have squirrels.