It's like athletes hating each other on the pitch/court, but being friends outside of it - because, in the end, they have more in common between themselves than with the outside world.
That was particularly true in the reactionary environment of the 19th century, when traditional hierarchies were fighting hard against "uppity" upstarts who did not fit conventions.
That was particularly true in the reactionary environment of the 19th century, when traditional hierarchies were fighting hard against "uppity" upstarts who did not fit conventions.