My future house may need something like this

They can disagree with me but they don't have to downvote my comment just because they disagree

What do you think the point of downvotes/upvotes is for? Because it looks nice? It's not to report spam or anything, that what the little flag is for

It doesn't make a lot of sense to downvote someone else's opinion just because you don't agree. If you care so much write an angry response.

What is the downvote button for

annoying/hate comments

No, that is what the flag is for.