EBay got rid of sellers' ability to leave negative FB a few years ago for the very reason that people ended up constantly "screaming" at each other in FB. It became quite obscene and embarrassing at times, and from a general point of view it reflected badly on all sellers. I'm sure it must also have frightened off many new buyers from even using the site for the first time.
EBay needed to fix the mess, and what they did was to take punishment of buyers out of the hands of sellers and put it into a background system (as 'reallynicestamps' has described above).
You, as seller, don't directly see the consequences of bad buyers' behaviour on this site (neither do the buyers, for that matter, until they are kicked off eBay), but believe me, they are there. When you have a truly problematic buyer, just follow through the available Unpaid Item Dispute process, block that buyer, and you'll be doing yourself and every other seller a favour. No one really knows how many strikes it takes for a buyer to get the heave-ho from eBay, but I don't think it's very many.
Also, as noted by the other posters here, make sure you set all your buyer preferences properly to prevent naughty buyers who may have already racked up some demerits, from being able to purchase from you in the first place. To do that, go to your main Selling page, under "Account\Preferences\Buyer Preferences\Edit", and choose the options you want.
Keep in mind that this is different from blocking a particular buyer (using his/her ID), which has to be done separately under the "Block Bidders (Buyers)" screen - click on the link near the bottom of your main "Summary" page.
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