Irish people have actually been oppressed in America since at least the early 20th century as well as Japanese. Technically everyone has experienced racism of some form
Indeed, I live in Britain, so I haven't heard much about the Irish or Japanese oppression in the US. Although, I do feel very bad for any race, religion or any people who have experienced racism.
white Americans, getting racism from some memes that went too far; "Only black people experience racism"; French people, again suffering from some memes going too far; Brits, suffering from racism from people thinking it hasn't changed since colonial times; Slavs, experiencing racism from overreacting activists thinking that things are worse than they really are; The Irish, who have been a victim of racism because of overreacting people since 1972; Jews, who have experienced horrifying acts of oppression throughout history