wow, we are all passionate about our birds and home....i have been lucky to have neighbors who don't mind my birds. this person must have had some sort of issue to approach a neighbor in this manner. he may be all bark and no bite, IF he returns apologize for the noise(even though you have a right to have the bird) but explain to him how uncomfortable you are in the manner he approaches you about it. tell him you are trying to compromise, then ask him to leave nicely. then go inside, don't argue. if he does not leave then call the police. he may not know he acted uncivilized, but this will keep things from escalating, and giving you grounds for a trespass notice. good luck.