As in people disagreeing with my scores and having an argument with me? If so... Nah, it has neverhappened. No one cares about my scores. Hahah.
Or if you mean having second thoughts a while after having rating something on MAL, then I can alwyas update that review and score to reflect those changes or at least explain that I'm conflicted and explain what in the manga/anime is making me feel torn about the score to give it..