Feng Jun's assertion was actually not incorrect at all; the designation of "wild cultivators" is merely a social stratification imposed by cultivators themselves.
Wild cultivators aren't favored by mainstream society, but as long as one has reached the Qi Refinement Realm, they are considered a cultivator. The only reason they lack confidence is that they do not belong to any power and their heritage is insufficient.
If they truly have a heritage, they are, in fact, considered loose cultivators.
Feng Jun considered himself a wild cultivator, but in Senior Yan's eyes, he at least qualified as a loose cultivator—everything can be faked, but not one's heritage.
Regardless, with Feng Jun's cultivation level at the mid-stage Qi Refining, the Cultivation World could not interfere with him unless he acted inappropriately in a blatant manner.