The underlying policy predates Macron, as it was decided under Hollande (albeit Macron was his economy minister). The policy is to raise taxes on gas little by little to reduce its usage, and that of diesel even more quickly so that the prices of "normal" gas and diesel would converge by 2022. [1]

Macron decided to go faster than initially decided by Hollande. I would not call that a "fast one", especially given that IIRC it was announced during his electoral campaign. Macron electors are mostly urban middle class, so are not affected by taxes on gas that much...

[1] Here is a graph (the article is in French): https://www.ledauphine.com/economie-et-finance/2018/10/24/pr...