When you fed them, were you suited up? You said when you were on your deck cooking, they bullied you, mine for a few days would not leave me and the family alone, buzzing all around us, landing on us, it did drive my wife inside, but if they don't sting then I'm not sure if its investigating you or warning. Seems when they don't want me around, they fly side to side, right in front of me while getting closer a little at a time, but the side to side motion is very fast and direct.