in other words: you're assuming that rich people are wonderful and that criticism is therefore unfair; others are sceptical that the wealth and privilege is justified and so feel that the criticsm is fair.

so the difference is political. labeling it "tall poppy syndrome" is a framing technique to "smuggle in" the assumption that wealth is deserved.

and to answer the question of "where it came from" - questioning the right to wealth is not a new idea. if you think it's something specific to reddit then you might consider learning more about alternative political viewpoints.