The concept of “white” as a race dates back to WW2, at most.
Wow I'll make sure to tell all my black friends, I'm sure that'll endear me to them.
When the Irish immigrated to the US, they were considered equivalent to black people by Americans and competed for the same jobs.
Well, this is just completely false, you're completely disconnected from reality. Irish were never blocked from whites-only schools were they? Irish people were never subject to interracial marriage laws afaik. Were any Irish ever entirely excluded from being able to immigrate to the U.S.? I know it's popular among certain groups to pretend certain Europeans faced the same disadvantages as formerly enslaved African-Americans but frankly it's incredibly insulting and tone deaf as fuck.
Theory is fine you guys but you need to actually go out into the world and interact with people sometimes.