People are free to post whatever they want, including any type of signature, as long as they do not break any of the CoC rules and keep the discussion centered around Overwatch.
People should be only discussing the points made by the person they are replying to. Being unable to do so and disregarding the points made only to dwell on the signature, the rank, the idology or the identity of the person is indirectly admitting you are running out of arguments or do not want to discuss in the first place.