I disagree but don't think you should be downvoted.

I wouldn't say it is explicitly stated in the rules – the rule they cite prohibits "Engaging in any act that, in Blizzard’s sole discretion, brings you into public disrepute, offends a portion or group of the public, or otherwise damages Blizzard image."

Which is basically a catch-all for, if we decide we don't like it, we can prohibit it.