Has there ever been two Supreme Court justices who were reported to hate each other?

[World politics is up Schmitt creek]

Frankfurter really didn't like the more liberal on the court, particularly Douglas and Black, but also Warren.

I believe MarkD has pointed out that in Frankfurter's memoirs he calls Douglas one of only two genuinely evil men he had ever met, the other being some private citizen or other whom Frankfurter grants the dignity of namelessness.

In addition to Frankfurter's hostility to Douglas and McReynolds's universal unpopularity with his colleagues, it's becoming increasingly obvious that Kagan can't stand Kavanaugh. Stephen Johnson Field in the late nineteenth century is also said to have been a widely disliked man.

[World politics is up Schmitt creek]

Frankfurter really didn't like the more liberal on the court, particularly Douglas and Black, but also Warren.

I believe MarkD has pointed out that in Frankfurter's memoirs he calls Douglas one of only two genuinely evil men he had ever met, the other being some private citizen or other whom Frankfurter grants the dignity of namelessness.

In addition to Frankfurter's hostility to Douglas and McReynolds's universal unpopularity with his colleagues, it's becoming increasingly obvious that Kagan can't stand Kavanaugh. Stephen Johnson Field in the late nineteenth century is also said to have been a widely disliked man.

Stephen Johnson Field is a name I've never heard before. TIL.

He's best known for his role in the early development of the substantive due process concept, which of course at that time was mostly used to strike down business regulations before twentieth-century Court majorities repurposed it as a tool for expanding privacy rights.

Why would you say he was so unpopular?

Political overambitiousness, mostly. The sources I've read on him are clear that he was not a well-liked man but less clear as to exactly why not.