This jives with my experience as well. Chinese has a ton of near homophones that are distinguished by tone. One interesting result of this is that Chinese speakers seem to hate hate hate accents, even just from other parts of China. I hear because it's just mentally taxing to listen to.

Though I'm certainly not 100% bilingual. I like to think it isn't just that I'm annoying to listen to. I have heard other speakers get put down as sounding like 'birds chirping' which seems to be a popular way to describe accents.