And yet, your little slice of the world doesn't represent the world at whole.
If you're ignorant of the situation, maybe don't come out with such a self-centered (and arguably, arrogant) statement; and especially don't double down on it when corrected.
People also have have the choice to ignore their racist grandparents spouting right-wing ideology or try educating them out of hope they'll shift their viewpoints.
Unfortunately, like many in that group, it seems you'd rather double down on your ignorance.
Not everyone was rich enough to know how the world looked elsewhere, connecting to all kinds of BBSs.