I don't think anyone here happens to be some godly being gifted with omnipotent powers, who can predict the future and how people will react to what they read. Damn, I still have very vivid memories of books/cartoons I've watched as a small kid, and that traumatized me for years. I'm still uncomfortable with certain things about myself because of what I keep on seeing in the media, constantly, awful messages and bad portrayals that make me feel like I just don't belong. And I can tell you that my past teenage self would have been extremely upset by a comic like Learning Curves.
It's this kind of idea that "it isn't a big deal" to have unhealthy romance, abusive friendships, peer pressure winning another day, etc in the media, that's causing a lot of the shit we see around us. Have you never questioned how much of an influence all the books, movies, cartoons, comics, games etc have on people, especially children? Then maybe you should read some studies about it, because they, at least, have clear insight on the topic. Yes, media do have an impact on us, and so in the long run. We shape our society through culture, and like it or not, pop culture is still culture. The most prominent one, even. We'd like to think we are so smart that we're not influenced by those things, but we all are, and it's no use to dwell in denial.
So yes. It's a big deal, and it's a big deal in the long run. A very big deal.
Imo, people who don't think so probably shouldn't publish anything they create, because they certainly aren't responsible enough to engage in something that has such an impact on society. There are certainly other things they can do. We don't need more toxic content.
The good comics out there are mostly made by people who are aware of the issues of representation in the media, and try to invert the curve, by creating safer, healthier content.