I have sent a PM to theymos as @qwk was unable to confirm my identity and just personally tagged me without any evidence of my account being hacked.
What would you need the reputation for?
Like you said, it wouldn't [effect] you.
A negative rating stands out to those that would do trades with you. Given the possibility of a compromised account, it's better to guard against anything in the event that a new owner does scam.
Yes, it won't effect me but I see this as an abuse of power, which is clearly without any evidence and anyone would not bare a fake trust here.