Reverting someone elses work can be a great source of friction in OE. As such, these need to be handled carefully, preferable on technical grounds rather than personal ones. Some cases are clear, e.g. if the orignal patch author requests a revert then this should generally be accepted.
Now that OE uses layers, the situation is relatively clear since each layer has clear and documented maintainership and it is up to the layer maintainership to make decisions on whether code should be reverted.
In cases where there is any doubt, the OE TSC has final decision and authority.