This study delves into the impacts of both talker dialect labeling and listener language experience on the perception of a phonetically ambiguous nasal coda among Shanghai Mandarin speakers. Through a matched-guise online perception experiment, we explore how these factors influence speech perception. Our results indicate that greater exposure to a specific linguistic variety leads to a closer alignment of speech perception patterns with that variety. However, it is noteworthy that, in the context of the present study, talker's dialectal labeling does not appear to wield a significant influence on speech perception.