Chopin was known to like and even teach his students Beethoven's Piano Sonata No. 12; so he did not categorically ignore or dismiss Beethoven's genius. However, their basic temperaments and harmonic approach were widely different, which should be apparent just from hearing them.
Chopin was highly influenced by the harmonic principles that Bach used so creatively but with discipline, and in his own way he tried to be equally free yet disciplined (play his first Etude slowly and it's very Bach-like in its harmonic logic and structure). On the other hand, he felt that Beethoven broke too many of such principles -- and that's one area where he parted company, not to mention that Beethoven's frequent emotional explosiveness was at times considered vulgar and unrefined. If so, it wasn't the first time that Beethoven had been accused by others of vulgarity, including his use of the Ode to Joy theme in the last movement of his 9th Symphony.
Nevertheless, Chopin was obviously familiar with many of Beethoven's works for piano to have developed his opinion about the German master, and IMO should not be faulted for preferring other composers more, such as Bach, Mozart, Hummel and Field, whom he most likely considered more refined and less rambunctious in their overall style of composing. Surely, if nothing else, Chopin was the embodiment of refinement, and his music is full of undreamed of sensitivity and subtleties.