Familiar with that "one drop" rule am I

With a humorous 1960's and later revelation anecdote I can share. I was about 6 years old and confused why my father, myself and my siblings were relegated to a separate table in the garage at my grandparent's home come dinnertime when our great grandparents were still alive. Double down on that confusion when my grandmother explained it was because we had the "bad blood" (native American). Oh, my...
Convinced was I this was some sort of disease, when my mother took me to the doctor for a checkup upon our return home, I bravely held out my 6 year old arm and told the doctor he needed to test my blood. To the confused head tilts from both doctor and mom, I explained:
"Grandma said I have the bad blood." Mom turned a funny shade of red and said "I'll explain".
Fast forward 40 years, and a summer motorcycle tour of some of my relatives abodes with my lily white blood cousin proved out to be sickeningly interesting, some where I wasn't even welcomed in the door, and others where I was "jeckled", Fox Noise blaring in the background. (!?) What an embarrassing mistake assuming blood was thicker than prejudice. Embarrassed I'm related to these idiots and why my "polluted" branch of the family has always been on the west coast, separated. My brother explained it was also why my mom had to elope with dad to California way back when to marry him. I admit to some lifelong ignorance how just that bit of darker skin tone of mine... still has me "caste" as an untouchable. I won't make that mistake again.