I am not certain with which premise you are disagreeing. I have not suggested "pumping the rainbows and unicorns everywhere;" I am not sure what that even means. I also do not know what you are referencing when you say "standards for everything are bad enough."
I was referring to a negativity bias that is pervasive in our culture and society and is directly associated with many of the on-going and worsening ills that we have observed, e.g., increased tribalism, divisiveness, insecurity, anxiety, isolation, loneliness, depression, pessimism, antagonism, etc. I am not advocating for a shift to a positivity bias, aka "toxic positivity," which also increases alienation and distrust. I am advocating for a balanced, pragmatic perspective that acknowledges our relative strengths and weaknesses and encourages collaboration and cooperation.