you can retaliate back but like what I said if it is not no need to worry, and if the reason is not valid.
This is poor advice. Someone leaving you a negative rating is a not a good reason to leave them a negative rating back. If I don't trust someone because of something they did, that does not mean I myself am untrustworthy and deserving of negative ratings. In fact, leaving frivolous retaliatory ratings is usually the kind of behavior of we have come to expect from scammers. Honest users tend to appeal against it and state their case factually, not just go in guns blazing with retaliation.
Note that the linked image in the OP is a yellow trust flag, and not a trust rating.
To expand on DdmrDdmr's already spot-on answer, in the cases of trust flags you don't need the person who left it to remove it like you do with trust ratings. If you can convince enough DT members that the flag is incorrect, they can vote to oppose it. If more or equal numbers of DT members vote to oppose rather than support this type of flag, it will not longer be visible on your profile.