I go to the chat room a lot and was in it recently when someone was asked to please change their font color. They either didn't see the request or ignored it, I don't know. I think some ppl like to type in a different color so that they can find what THEY typed as sometimes the room gets very busy and it's hard to keep up. Not that they shouldn't help a fellow board member see better by changing to a readable color.
If anyone in the chat room were to ask me, I'd happily do it. It's just color, why would anyone mind changing it?