Alice and bob are people who committed those things. A citizen in the US has nothing to do with ww2 Japanese internment camps, slavery, etc so it's not hypocrisy to point out what another country is doing.
If your country do those things, some people might feel is hypocritical, because a citizen of {evil_country} have nothing to do with {crimes}. Just because Alice's country did it long ago, doesn't mean Alice have the higher moral ground over Bob. Again, just pointing out what it is. Don't care, TikTok, Facebook, Snapchat,etc can dissappear tomorrow, and I wouldn't notice.