I partially agree. If somebody is leaving a juvenal comment, or one that’s completely subjective, then yes it’s a waste time arguing with them and you’ll likely get frustrated in trying.
But I wouldn’t say there is no need in responding to people’s opinion as a general rule. If people are mature about their differences in opinion, it’s good source for seeing other points of view and exchanging ideas.
En1gMa92’s comment in retrospect was pretty subjective when she said it’s “that's incredibly rare”, I doubt we were ever going to see eye to eye on that part.
Still when she said “Great art design” I thought she was ready to discuss it on a technical level, and if she could have elaborated on what she meant by “art design”, and what impressed her so much about it, it might have helped me see something more in the drawing I didn’t notice before.