I'm not doing anything against the rules, they say i can buy and sell accounts.
Exactly. If you were doing something against the rules, you would receive a ban instead of a negative trust. Got it now?
But referrals aren't allowed and Steamtyme has a referral link in his profile, so, who is the bad guy here? Who is against the rules? and who is abusing the system?
You better take another look at the rules. Referral links are allowed in the signature and personal message fields. They just aren't allowed in posts/threads (mainly if the user is spamming it).
But if people want to abuse the trust system then expect a consequence for it.
You are the only abusing the trust system (by giving retaliatory feedbacks).