What opinion could get you massively cancelled in 1923 and 1823?

Trans rights are human rights

Gay rights are human rights

Black peoples rights are human rights

Women's rights are human rights

Human rights exist.

These will still get you cancelled in 2023 in some countries.
- Correct
"Trans isn't a word. Everyone has a right to be gay, jolly and happy or whatever synonym you want to use."

someone from 1823, when "gay" meant "cheerful".
- "I say there can be no justice, so long as the sodomites are not allowed to practice love as they will!"
- Maybe he means trans-Atlantic rights?
Poland, Warsaw (then had separate legal systems), The Netherlands, Bavaria, the Dominican Republic and El Salvador all decriminalized same sex relationships in the 1810s and 20s. So it wasn't exactly all completely dead-against.
"If I could but play the advocate of the devil's for but a moment; does not an educated person, who hast accrued more whelth, hencewheretofore demonstrated a more explicit display of personhood?"

an edgelord/temporarily embarrassed thousand-aire of the time, probably.

1923 - "we need to scrap the harshest measures of the treaty of versailles and help Germany's economic recovery, otherwise these national socialists are going to exploit the misery to gain power" lol

That wouldn't get you cancelled, that was basically the position of the US government which led to the Dawes Plan in 1924 to do exactly that. The impact of Versailles in the rise of the Nazis wasn't so much economic, by 1924 Germany was probably saving more by not being allowed to have a large army than it was losing to reparations, and the period of 1924-1929 was even called the Golden Twenties. The humiliation factor of how it was negotiated and imposed however played right into Hitler's hands.
That or gut them much harder

Idk about 1923, but in 1823 you would definitely get "canceled" for saying that washing your hands is good for your health.

"Hah! Germ theory? Preposterous! I should think these 'germs' no more real than the tooth fairy. Why should the patient sit in their agony while you rinse your hands when there is surgery to perform? Why, it's downright disrespectful, wasting the patient's time like that, as if you care more for the tidiness of your person than their well-being. I should hope that no poor, beleaguered soul has the misfortune to find themselves under your care"
It's a shame how they railroaded him into the poor house for such ideas. Sometimes being first is the worst to be.

1823: we should let the Indians have their land

1923: we really need to go over to Europe and stop that Hitler guy

1923 is a little premature. He wasn’t appointed Chancellor of Germany until 10 years after that. Hitler was actually in prison in 1923 for attempting a coup, so it wouldn’t have been too upsetting to say you were against him.
- It wouldn't have been Hitler that would have gotten you canceled. It would have been suggesting we go get involved in another war so soon after WWI with no real evidence that it would be important.
- However later on there was more support even among Americans with the US Nazi party that existed and tried to run in elections.
  
  To be fair many around the world saw Fascism as a new exciting way to run a country until war broke out. Then those Nazis and fascists were only good when they were dead.
  
  I wonder if those cosplaying as Nazis today understand they aren't the heroes they think they are especially when it comes to US WW2 veterans, (many would consider the real heroes) would want these newer Nazis dead too.
Hitler was always criticized. There's a NYT report calling him out as an antisemite in the 1920's and Casablanca looked down on Nazis almost a decade before the first signs were showing of the holocaust to come.
- There's a NYT report calling him out as an antisemite in the 1920's
  
  Sure, but this was at a time where you could get antisemitic magazines delivered to your door, and some people had dozens. There really wasn't as much stigma on it as now (And I'd argue it could use a little more stigma still). There were lots of places around the world where you could discuss the latest details of antisemitism with your hairdresser, and it wouldn't even be that weird.
- Who is Casablanca? Or do you mean the film?
  
  The play that the movie was based on was written in 1940.

In both eras, colonialism and militarism were still going on, and even though many powers condemned these two things, if we rule out things that weren't obvious like being a murderer, you could bet on supporting desertion and draft dodging getting you cancelled in all countries. This is literally how Red Badge of Courage starts.

All of them?

Liking femboys