I'm not a graphic designer, it's just a mockup to illustrate my ideas. I'm sure someone more talented than me can make it look good.
There is a "downvote" button. It's the "hide" link that is currently shown between "save" and "report" with no functional change, just moved to a more prominent place. Pressing it gives you the psychological satisfication of an act of disapproval, and it keeps the offending post out of your view, but it's not counted and does not interfere with the post rankings. Let's make it our downvote button.
No more "funny means downvote hurr durr"
No more raw vote numbers on posts listings. Just a "90% insightful" or "70% fun" rating seems more accessible to me (the raw votes of the post can still be seen on the comments page). There could be a special case for highly upvoted posts that are both insightful and funny. (NB: I sometimes find myself doing arithmetics in my head to calculate the vote ratios, I wonder if others do this too.)
(Not shown in image) The "0 fun" or "0 insightful" ratings on comments should not appear at all. They add no useful information, don't show them when they're zero.
Edit: the "comments" link on posts should also be more prominent imho, but I don't know how exactly. Now it's more than three ideas.