Unfortunately I don't really bookmark tweets so I can share them 1-2 years later with folks who won't bother to search for them, themselves.
Sorry, you'll have to take my word for it, and you'll need to have enough interest and curiosity to care. I don't mean to assume you don't, and I want to think you're genuinely interested in knowing, but at the risk of sounding rude, people who usually ask for evidence or examples didn't spend any time looking on their own, and seek only to condemn, deny, or denounce the OP's claims at any cost — or worse, when evidence is shared, twist it into something it's not and make excuses for it.
A quick search got me reprehensible posts generalizing White people, or highlights patently racist behavior towards Whites by people (and news media) that are still allowed to exist quite freely on Twitter, like so:
Generally the most likely response at this point is "You're cherrypicking" (and thus invalidates my entire claim), right?
Disclaimer: my snark isn't directed at you by the way. I just find it fun to presume the outcomes of a — 1) share 2) evidence pls 3) shares evidence 4) ??? — interaction.
