Embodiments of the present invention disclose a method, a computer program product, and a computer system for proactive comment evaluation. In embodiments, the invention includes detecting a comment being added to a thread and extracting data relevant to the thread. In addition, the invention includes identifying an average sentiment range of the thread based on the extracted data and a model, as well as identifying a sentiment of the comment. Moreover, the invention involves determining whether the identified sentiment is outside the identified average sentiment range and, based on determining that the identified sentiment is outside the average sentiment range, recommending an alternative comment.