I mean, it's anonymous... so people/competitors seem free to nuke other users' pulse.
Some suggestions are 1) why not make Dislike not affect pulse?
2) force a comment (anonymous, but force a few words?)
3) just publicize the name of the disliker, but not affect pulse? So that an opinion can be rendered, but it is simply left at that.
4) why not have effect of dislike based on total number of views/likes? The first dislike when someone's pulse is 99.5 (probably at 300 + votes) shouldn't matter anymore... And an early dislike shouldn't prohibit someone from achieving a 99.5 with a similar number of votes as per usual...
I know, then why would anyone use the dislike button? That's the point. It seems the only people who use DISLIKE are gamers of the system.
The other point is that, it's weird, right? I mean, if I don't like something, I ignore it (art, movies, music, books, etc). If I take time to talk about it, it implies that at some level, I do like it - or I see potential. Then it makes more sense to offer some reasons as to how I think the image can improve.
A Dislike button that lowers someone else's mojo seems uncharitable. I have read the 500px staff comments about it; I can see where they are coming from... 500px uses it as a computer friendly way to rank things. To me, it isn't a human-friendly way to start art discussions.
As a User, I am not sure how it benefits me, as it currently stands. I have no way of knowing why someone disliked something. that's the real problem... it doesn't really offer anything constructive I can use.