Sense of humour failure

Just the other Saturday, my wife and I were invited to a Eurovision Song Contest party. The only way to approach a gathering of this kind is to adopt an ironic posture from the outset.

After discussing the relative merits and demerits of the performers, the discussion turned to former winners, notably Dana International, the Israeli trans-gender ladyman who won a few years back. I turned to a friend and asked him if he would be prepared to do a trans-gender woman (post-op). He seemed horrified by the question and, after glancing nervously at his wife who was sitting by his side, responded:
"But I'm a married man!"
Somewhat perplexed I answered that the question was entirely hypothetical. He  refused to give a straight answer to my enquiry and the subject of conversation moved on. A few days later the same chap rang me up inviting us over for a meal. He then took the opportunity to admonish me for my "inappropriate and off-colour" remarks on the Saturday in question. It isn't often I get told off for my behaviour these days, and I told him so. But he maintained his position and we had to close agreeing to differ.

Later that day, he having told me his wife felt the same way, I phoned her and pointed out that I was not used to having my light-hearted conversational banter being censored. I cited a recent conversation between me and my own wife while watching a film staring Colin Farrell, who was looking particularly cut. She announced that she would very much like to do him and asked my permission. This I granted, though adding that my condition was that I should be allowed to watch. It didn't help: she was horrified a husband and wife could have such a conversation, whether or not they thought it amusing, and seemed impervious to my insistence that the exchange between us constituted "humour". WTF? What's happened to irony? Are they screwed up, or are we disgraceful? You decide.