Wow.
I never saw a dogwood tree that tall. Most of them that grew wild over the mountains were more like understories. Same here in the western part of the state, just not very tall. Maybe 30 feet at the most and not many even that tall.
Maybe you only had an unripe walnut, Gin.
They don't seem bitter to me, just not as sweet as pecans. Now I don't like English walnuts much, nor white walnuts, but black walnuts I dearly love. I love pecans too. Never did like macadamias very much though.