If you've played Civ 6, you'll get this rationale. Gandhi is a living contradiction in the game as he is both a peacekeeper and more often than not, nuke happy. This means you can never appease the man.

Ally with him and support his decision to declare war? Gandhi hates you for being a warmonger.

Build Nuclear weapons and receive his support this turn? Gandhi hates you the next turn for proliferating nuclear weapons.

Don't build nuclear weapons at all? Gandhi commends you then proceeds to nuke you for being a state prime for conquest.

In short, like women, you can never appease Gandhi. Ever. Because Gandhi is backstabbing, lying, and contradicting asshole who hides behind the facade of gentleness and kindness while plotting to nuke the entire earth from orbit.