I'd question the sources of such statements. (EDIT: And music critics don't count, they tend to be wrong quite often and do not properly reflect the majority of popular opinions...

) Beethoven seemed quite popular even in his day. And even so, his music is still not strickingly different from other music of the same era, so if such assessments are true, perhaps people back then just didn't like any music?
Not to the degree of Beethoven and his contemporaries. If you ask a random person on the street if they've ever heard of Beethoven, they'd say "yes!" Schoenberg? "Huh?" Certainly many less would recognize his name... and his tunes.
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