+1
I sort of have an internal debate, on one side if agree gives +rep, disagree should give -rep. To me it is obvious that agree should give +rep. On the other hand, you can disagree with someone without it being a bad thing. I disagree with plenty of people, but I don't mean it negatively.
Overall I think this is a good idea. People agreeing with you should give +rep, and disagreeing should not conversely give you -rep. I do believe, however, that dumb should not be the only reaction that gives -rep. It feels too limited. I believe that "Bruh" and maybe a new reaction such as like... A thumbs down emoji that just means "Bad post" should be added. Not every bad post is dumb, and not every dumb post is a bad post. Bruh is also represented by a skull, and is pretty much never used positively.