You see them in public and your brain registers that unique event precisely because it is uncommon and rare. Because it has emotional salience, you remember it faster than say, if you saw a random white couple out in public. You don't remember the white couples, they didn't make an impression, the interracial ones did, so you remember them longer.
Your brain is literally playing tricks on you. You have to think about statistically: a portion of the whole. You're just looking at one small sub-section of the pie, not realizing just how big the rest of the pie really is compared to your limited scope.
Hope this helps, friend !
