Strauss Jr. was one of the few contemporary composers that Brahms admired. R. Strauss called him the ‘Laughing Genius of Vienna’.
I grew up listening to Strauss waltzes and spanish tangos on my dads Blaupunkt record player (a gian piece of furniture)
So there was no ill feelings by R. Strauss....I bet people got them mixed up a lot, they still do.\
I wouldn’t have expected that the composer of the Frau ohne schatten, and Egyptian Helen thought well of the other Strauss. Especially given that he was sometimes a snob, even when it came to Mahler’s music. But that might have been rivalry.