I don't give a fuck.
However I have 4 solutions for people who do. 1 to 3 require hardfork. 4 is a front end solution

1 no free downvotes unless 500 sp
2 no free downvotes unless 50 rep
3 no free downvotes unless active post or comment

4 hide dust downvotes and upvotes entirely worth less than 0.005sbd or 0.01steem, can view if you click details or change settings.

If it gets out of hand we can make something like dust bunny to help people get over their -0.001 or whatever it adds up to