I preface this by saying that I think your post is simply bait. In the unlikely event you're serious, I would guess there are several reasons for the animosity between blacks and Asians in America. I'll list three major ones off the top of my head.
1. Humans are naturally racist against demographics that do not look like them.
This should be obvious. If you live among an in-group your entire life and are exposed to a member of an out-group who looks nothing like the humans you've interacted with all your life, you're bound to be disturbed by his/her appearance.
2. Black culture and Asian culture are fundamentally at odds with one another.
Cultural perceptions of success are obviously influenced most by the context of that culture. As blacks were forcibly separated from their home cultures and soon forgot them, they were forced to develop their own culture in the context of their slavery in America. Given that they had no actual resources provided for them post-Civil War and remained third or fourth-class citizens, success came to be defined by what was obtainable by blacks. This was limited to crime and athletic ability. Guess what Blacks worship today?
Contrast this with Asians, who willingly came to America and so brought with them their traditions from Asia. In Asia, the principal hallmark of success is education (heralding to the civil service exams of the Chinese).
Another obvious one: blacks value being loud, bombastic, and attention-seeking. Asians value humility and deference to one's superiors (a lamentable trait).
There are many more such examples. Ultimately, the values of Black and Asian cultures are vastly different. Humans do not like communities that do not share values. Ergo, Blacks and Asians don't like each other.
3. Blacks resent Asians for the latter's elevated status as model minority, despite the latter being recent additions to America.
Asians have mostly come into the country in the past 70 years. Far less came in the preceding years after the CA Gold Rush and the Civil War due to the Chinese Exclusion Act, which to this day remains the only legislation passed by Congress forbidding the immigration of a particular demographic.
Despite the recency with which Asians have come into America, they have enjoyed by far the most success, and now enjoy the status of "model minority." Asians have the highest average household income, exceeding even that of whites. Blacks naturally look at this with resentment--why should these foreigners enjoy so much success so quickly while they, who have been in American for far longer, are left in the dust? Why do the foreigners get to reap rewards that were never afforded to Blacks?
In the same vein, Asians cannot understand why Blacks do not enjoy the same success that Asians do, and thus look down on Blacks for being willfully uneducated, violent, and impulsive. And guess what--most are, although it can hardly be said to be their "fault" in some sense.
Then the inverse can be said: it's impossible for the majority of blacks to have experienced a hate crime by an Asian, because most blacks do not live in the suburbs or in wealthier communities.
But isn't a strange and funny thing that pretty much all the violent attacks on Asians have occurred in cities? And isn't it an even stranger and funnier thing that such violent attacks have had black perpetrators? Excluding the spa shooter, admittedly.
I'm not denying that continental Asia, or even Asian Americans, dislike blacks. But don't pretend for a second it's not mutual.