It is the wrong thing to do even if you have the right to do it.
It might be wrong because you've been taught that it is wrong.
Until someone gets punished here for mentioning XT, there is no problem. If someone doesn't like it, then they are free to leave.
Cypherdoc's thread was locked after the discussion turned heavily towards XT. A Forum Administrator claimed the reason for locking the thread was that it was too broad in scope, so maybe you won't count this as "punished here for mentioning XT":
https://bitcointalk.org/index.php?topic=1157185.msg12199651#msg12199651Anyways, he's had to relocate his thread to a new location:
http://bitco.in/forum/threads/gold-collapsing-bitcoin-up.16/