“I suspect that some critiques of his philosophy are oftentimes subconsciously motivated by a desire to evade the guilt at how much better we Westerners are than the vast majority of the people on this planet. It's easier to pat ourselves on the back for social media posts than it is to donate the majority of our incomes to charities.”

100% this. The Singer solution to world hunger causes a lot of cognitive dissonance in us well-to-do Westerners. Most of us see ourselves as good, unselfish people, but the truth that we aren’t doing nearly as much as we ought as individuals leads to much psychological discomfort. The easiest way to dispel that discomfort is by attacking rejecting Singer’s solution.