I disagree with your final point. If the posters were related to a personal event—such as meeting your spouse in that foreign country—I think they DONT even think about what the posters ARE, but rather the personal memories.
I simply don’t think this is a huge deal. The guy is such a goof, there are so many other reasons to not like him.
And I reiterate, his wife is cute.
I didn’t say anything about liking or not liking these people.
I simply think it’s wise to realize the message which you’re sending in such a situation, personal momentos or not.
Suppose they had Third Reich memorabilia on their walls? Please explain to me why red star commie hats, Che posters etc. are chic with the left, and Nazi symbols forbidden. Both systems murdered millions.