you can leave responses to neg feedback which is what i've done. ebay will only remove feedback if it breaches their feedback policy.
eBay is provided with a valid court order finding that the disputed feedback is slanderous, libelous, defamatory or otherwise illegal.
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The feedback comment contains profane, vulgar, obscene, or racist language or adult material. Inflammatory language, such as "fraud, liar, cheater, scam artist, con man" etc., while strongly discouraged, will not be removed.
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The feedback comment contains personal identifying information about another member, including real name, address, phone number, or e-mail address.
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The feedback makes reference to an eBay, PayPal or law enforcement organization investigation.
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The feedback comment contains links or scripts.
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Negative feedback intended for another member will be considered for removal only in situations where the member responsible for the mistaken posting informs eBay of the error and has already placed the same feedback for the correct member.
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Feedback left by a person ineligible to participate in eBay transactions, according to Section 1 of the eBay User Agreement, at the time of the transaction or the time the feedback was left.
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Feedback left by a member who provided eBay with false contact information and could not be contacted. In general, the transaction period is considered to be 90 days from the end of the listing or 30 days from the date the feedback was left, whichever was longer.
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Feedback left by a member who bid on or purchased an item solely to have the opportunity to leave negative feedback for the seller, with no intention of completing the transaction.
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Feedback left by users who are indefinitely suspended for certain policy violations within 90 days of registration. eBay takes the position that members who are indefinitely suspended soon after registration shouldn't be able to permanently impact another member's account.
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eBay will automatically remove feedback from members indefinitely suspended within 90 days of registration. Not all suspension types qualify for automatic feedback removal. For example, accounts that are suspended for non-payment of eBay bills and instances when eBay provides the member with the opportunity to fix the issue (and be reinstated), do not qualify for automatic removal.