Honestly Humanity has been pretty arrogant. Took 100s of years before we recognised birds use tools. Mainly because everytime it was seen. Some other excuse was seen for why the bird was sticking a stick into a tree. Science was so sure mankind was unique it was unwilling to see reality.
But honestly if you think that is bad. Do some research into why European explorers thought Europe represented the most advanced civilisation. African cities raised to the ground rather then face the idea they may have been their before us.