A persons that have trouble distinguishing colors are ~10%, but I don't see websites having option to turn colors off and use black and white (it would be nice, but I won't make it a end of the world event). Or I don't see moderator discussions that referring to something as "red" or "green" is bad for color blind people.

If one already uses gender neutral pronoun, it should be enough, if it is not, then that person is a jerk similar to e.g. someone that whats to be called a "sir" (as in "yes, sir").