Searched and the first hit was "Napoleon Complex" https://yandex.com/search/?text=Short+black+man+syndrome
Coincidence? I think not! !
Had one of those at a place I used to work. Guy was literally short and had an ego a million miles tall. Got kicked out of police academy for using his police powers inappropriately while still a cadet - something about informing people in a bar exactly who he was and being heard by someone with the power to tell him who he really was. Went to work at a little company I had vacated, eventually got back into academy, graduated, went to work for a little town about 30 miles east of here, walked into a redneck D&D thinking he was the cock of the walk, got shot by a rifle and went to see Jesus.