Oh, Beethoven :shrug: I don't like Deep Purple either, doesn't mean I don't like rock music.
No. NO.
You can't equate Beethoven and Deep Purple. You just can't. Beethoven (via Haydn, tbf) basically invented the concept of symphonic music. Yes, he was terribly German and sometimes had the subtlety of a housebrick to the temple, but he also created sheer, all-consuming cathedrals of sound that are some of - if not the - greatest moments of music in history.
Deep Purple wrote Smoke on the Water.