I would say it is more likely to do with the fact that:

* BYD is new in Japan (since 2023) compared to other automakers which have built up trust over many decades.

* There are only 55 BYD dealerships in Japan vs 5,000 Toyota dealerships, 2,200 Nissan dealerships, 2,200 Honda dealerships, 1,500 Suzuki dealerships, etc.

* BYD offers a limited range of models in Japan - 6 in total. No minivan, for example, where minivans make up 6 of the 10 best selling (non-kei) car models in Japan

* Japan is very slow to adopt EVs in general. Charging infrastructure is poor

* BYD EVs and PHEVs qualify for a much smaller CEV rebate [1] than Japanese models, Teslas, etc. This eats away at much of the cost benefits

* BYD only just introduced their first kei model to Japan last month. It has been well reviewed, but even BYD isn’t expecting to sell a ton of them in their first year, let alone first month, due to the aforementioned circumstances.

Or we could just say it’s because Japanese are racist and won’t buy Chinese things - despite the fact that 22% of all Japan’s imports currently come from China. Because that feels correct, I guess?

To be clear I do recognize that are tensions between Japan and China. And there are plenty of Japanese people who would prefer to buy Japanese-made goods, or prefer to avoid Chinese-made goods (to the extent that's even possible). But there are plenty of Americans, Europeans, etc who feel similarly - and they aren't typically called racist for having the same preferences. There are valid reasons like wanting to support domestic businesses, or not relying on geopolitical rivals for manufacturing, that have nothing to do with racism. Canadians are boycotting US goods right now, for example. Is that because Canadians are especially racist?

And Japanese consumers are just as price sensitive as anyone else. As the end of the day, if they can get more car for less money buying Chinese cars (and if the cars and sales and support process can be sufficiently tailored to Japanese preferences), then Chinese automakers can be successful in Japan.

[1] https://www.cev-pc.or.jp/hojo/pdf/R7ho/R7ho_meigaragotojouge...