This is a request on behalf of my eyes and sanity, for the client to have a filter for those who wish to turn it on, to block out these 'forced colors' on text output some people like to use. By using special 'chat prefix' code, other players get to override my own settings for color on incoming chats, and I for one find this rude and offensive. Sorry to those who like it, but without a way to choose NOT to see them, having your colors forced on me, overriding my settings, is not good.
Please consider this request. My guildmates recently learned of this trick, and now it is becoming common there... and if I cannot filter this out (the clashing colors is straining my eyes -badly-, I have my colors set as I want to see them for a reason), I may need to LEAVE them despite they otherwise being great peoples. Or put individuals on ignore... almost as bad.