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In my expierence it's always been mostly doe that snort at me but have had lone bucks snort at me. I think that is mainly because the doe's usually come in first and are the first to be alerted.
My thought is that it is usually does and they are trying to smell you. They have seen or heard something they dont like but want to confirm with scent. So they're getting a good whiff and will usually bail shortly there after.
You got busted. I've had it happen to me many times, almost always a doe. I hate those bitches!