But also, I seriously doubt online discourse from a very small subset of Asian Americans on Twitter justify a daily wire article + 4chan harassing+ the topic consistently mentioned by white leftists to dispel any sense of sincerity when Asian American concern is brought up.

My problem is when white companies and financial firms try to make quick bucks from trendy Asian cultural products. Or when white people who genuinely know nothing or very little about my culture speak over me simply because they are white.

Yes which is why after reading the noodles and dumplings cook book I don't think anyone should be mad at the white lady.
Hell, her writing was a great entry for anyone who is interested in Sichuan cuisine (and much more southern Chinese cooking styles) but don't know where to start.

Benefiting from a system that scrutinizes and alienates the people from such cultures.

This line of thinking from white people is a lot more obvious in academic circles. When a lot of Asian studies PhD can't even understand the language of the groups of people they are studying.
They get to pick and choose what culture they like and wish to be connected with while building and

White leftists often become the most defensive multicultural neo-liberals once Asian people voice their concerns(justified to these white people or not). I think it speaks a lot about the modification of culture and how Asian Americans cultural identity is tied up with cultural commodities.

TBH I think there's a much deeper reason why a lot of Asian Americans feel defensive when white people profit on our culture, especially when it comes to Asian food, often the last resort of connections to their ethnic identities.
And I also find it funny how white people react to this complaint

Imagine becoming a human manticore (they are supposed to have three lines of teeth)