Hi fellow Imgurian,
just made a quick step-through tutorial on how to downvote and report all captions of a spammer.
Only tested on chrome

1. Click his name to see all his captions.

2. Then type in your browser "javascript:" (whithout quotes, don't forget the ':', this has to be typed by hand, not copied/pasted).

3. Then copy/paste this little code right after "javascript:"
var h=document.location.href;if(h.indexOf('gallery')>0)return;var da=document.getElementsByTagName('div');for(var i=0;i<da.length && h.indexOf('gallery')==-1;++i)if(da[i].title=='dislike' && da[i].className.indexOf('pushed')==-1)da[i].click();da=document.getElementsByTagName('a');for(var i=0;i<da.length && h.indexOf('gallery')==-1;++i)if(da[i].className=="report-caption-link")da[i].click();

Keep your enter key pressed to accept all validation messages.

4. Go down the page, press "Next", repeat from step 2. No more "Next" button ? Great ! You've reported and downvoted all his captions to Hell ! Now proceed to step 5.

5. Profit

Thanks for your participation. - stant


PS: If you do this to non-spammers, you're not even worth a shit.