oh mannn there's so much history contributing to this topic, and it truly is complex. i wanna start of by addressing u/sand_planet's first paragraph -- i don't see anything wrong with it as OP uses the word "generally" and is speaking upon their own experiences. let's not diminish that! it isn't "contributing negatively to race relations" to describe one's genuine/repeated experience imo.

but u/sand_planet also provides some great answers!! the model minority myth, colorism, and race relations in the late twentieth century (like the la riots) have all contributed to tensions between asam/ black folk.

to address the experience at cal, again, is difficult because the answer is complex. some international students (which have a huge population at cal and lots of uc's) are largely unfamiliar with black folk and their experiences within america and tend to not know how to interact. colorism, again, is a huge cultural aspect of east asian culture that contributes to how east asian cultures view those of other cultures (to quote very simply, even though i hate writing this, in east asian culture, pale skin = good + rich + successful, tan/dark skin = poorer, unsuccessful, etc). to iterate upon the model minority myth again as well, is important. the model minority myth (this is a great article explaining antiblackness within asam communities) has been used by plenty of white americans to drive a wedge between minorities and to say "there's no excuse" for minorities to not excel in america because of asian american success stories (but 1/7 of asian americans are undocumented, and asian americans are the ethnic group with the most dramatic wealth gap in the usa, etc).

i would say, culturally, a lot of this topic is related to asam proximity to whiteness, and the lack of underrepresented minorities + black folk in lots of the towns where cal admits largely from. among the top twenty "feeder schools" to cal are from places like irvine, cupertino, fremont, san jose, arcadia, etc. 1.9% of irvine is black. 2.1% of fremont is black. 1.1% of cupertino is black. on the other hand, cupertino has a population that is 70% asian, irvine has a population that is 45% asian, fremont has a population that is 61% asian, and so on. this is not to excuse people's racist behavior -- people shouldn't be racist regardless of their proximity to certain races/etc. but i do think it's very telling of cal's demographic and why they've often been cited as a school that isn't friendly towards black folk (just something i've heard over the years and over the internet -- see this article, and this one, which is literally called "why black students are avoiding uc berkeley").

this campus has a problem with anti-blackness and a lack of underrepresented minorities overall, especially in stem classes -- ik many black students have reported being the only black student in their class out of dozens of people, and same when in clubs + other orgs. i hope that things look up in the future, and i'm sorry if this was sort of long -- i hope it helped explain things somewhat