While I understand that some players want to stand out, I feel very displeased seeing my chat tab constantly change in colours. I guess you would expect a particular chat tab to be in a colour of your own choice and not a choice of some 20 year old teenager.
That said, I would like to know whether there is an addon that completely negates any changes applied to chat by other players. If no such addon exists, I would greatly appreciate other workarounds or perhaps request one dare I say.