二人きりのところを邪魔するなんて野暮だよ。
It's tactless to intrude when the two of them are alone.
野暮なことを聞くようですが、お二人はどういうご関係ですか。
This may be a tactless question, but what is the relationship between you two?
冗談にいちいち理由を尋ねるのは野暮というものだ。
Asking for the reason behind every joke is simply boorish.