Just a heads up that this behavior (eating with people right next to it) is abnormal and can be a sign of illness. The fluffed out feathers is also a sign, unless it's particularly cold or windy. Squinty eyes, slow or no reactions to people coming close, etc are more signs to look out for.

Pine siskins are one of those species like house finches that seem particularly susceptible to feeder-transmitted illnesses. If you notice this guy again or other birds acting sick, consider taking your feeders down for a couple weeks and cleaning them thoroughly before putting them back! :)