There has been a rise in hate speech against Black Americans. gay men, and even Jewish people. According to the New York Times, after Elon bought Twitter slurs against Black Americans increased in appearance from 1,282 to 3,876 times a day. Similarly, slurs against gay men rose from 2,506 to 3,964 and antisemitic slurs rose more than 61% after two weeks.
One theory for this is that the accounts that twitter used to regulate or were previously banned were allowed back onto the site when Elon purchased Twitter for $44 billion. For example, Donald Trump's Twitter account was reactivated after the repurchase of Twitter for which it had previously been banned for tweets inciting violence. Accounts on Twitter that are associated with QAnon conspiracists and ISIS terrorist groups were allowed back onto the site as well. The Twitter Anti-Defamation League which reports antisemitic tweets and tracks posts have gone down in taking action against harmful posts by 50%.
Elon has not provided the details of how he is measuring hate speech on twitter, only that "hate speech impressions" have decreased by 1/3 since his purchase of the site.
source:
https://www.nytimes.com/2022/12/02/technology/twitter-hate-speech.html