I have said that I don't mind being downvoted if it is for a serious reason. A legit reason other than just for downvoting something just because you don't like someone. So no, I don't care too much about being downvoted. I care when it is for no reason and when downvotes hamper the community by hiding actually good creative ideas.
It hampers the community when people downvote for no reason other than to just downvote, and when there is a spree of downvotes on multiple concepts at the same time it is more than just "People disagreeing". It's them being assholes without even taken the time to explain why they downvoted, and to give ample feedback to the concept creator so that they might better their concept.
I accept downvotes when it is for a good reason. A post that is being trolly, a post that is offensive, a post that is just plain bad (with ample feedback explaining and helping the creator along rather than leaving them in the dark), and posts that are just plain rude to others or riot themselves.
I've asked simple questions before such as "Does Yasuo's wall no longer block Lux's Ult". Because I thought it did before, but it didn't. So many people disliked my simple curiosity. Why downvote someones simple curiosity?
I've also posted a concept, and others have as well, and just 5s later it's downvoted. Tell me that's just "disagreeing". It's trolling and being a hamper on the creative community of league.
I appreciate your opinion, but I don't think you understand our points for those of us who agree with this. I don't mind downvoting, but I mind it when it is for no reason other than to downvote as I've said.
You say it's not an issue that deserves attention, but when it completely puts off people to the community and hampers the spirits of new people on the board and pushes them away then yeah. It is an issue. Downvotes shouldn't be used just for shits and giggles, and those who downvote shouldn't do so if they don't like the person, and the least people who downvote can do is explain why and what should change for them to like the post so as to help rather than hamper.