This meme didn’t even mention race at all.
But since you mention it, allow me to explain. White people make up a majority of the US population, about ~65 percent. African-Americans make up about 13 percent. The latter represent at least a quarter of all police shootings and white people make up just over 50 percent. That means relative to their overall makeup of the population, whites are underrepresented and black Americans are over represented.
When you consider the number of shootings proportional to their overall makeup of the polulation, black Americans are 3-6 times more likely to be shot to death than white Americans by police.