Short answer? No, it shouldn't matter at all who you date regardless of ethnicity. However, as someone coming from an Asian background as well, I understand how much family can influence these matters and how much their opinion matters.

Can I ask which ethnicities you are?

It sounds like you're very attracted to this person, but your mother's biases are definitely coming off strong. Something I might do would be to make a list of things I thought about said partner, and then things that your mother (but not you) think about him and try to sort of what you think and what your mother thinks, so you have a clearer picture of the situation and your own thoughts and feelings.