Do you know what 'ra-nuki kotoba' is? Apparently quite a lot of students use incorrect language.
Literal
Ra-dropping words [topic-って] know? Quite incorrect words [object-を] use students [subject-が] many [seems-みたい].
ら抜き言葉 'ra-dropping words' is a famous topic in Japanese linguistics — the tendency to drop ら from potential forms (食べられる → 食べれる). It's technically non-standard but extremely common in modern spoken Japanese. The sentence combines a meta-linguistic question with a prescriptivist observation.