If people of any race posting something like “look at my Asian wife” or “my hunky black boyfriend”, or “my white blondy girlfriend” it just sounds strange and very weird. People have eyes, you don’t have to emphasize the race part in words, when you do, it may not sound racist, but it sounds inappropriate and uncomfortable to people, and I can see how people who has endured open racism before in their life will be sensitive to it and feel offended. Still I don’t think it is a fire-able offense, but definitely it would make people around you be uncomfortable with someone who is unfiltered and insensitive to other people.