In the latter half of Malachi 2 God employs some strong words to convey His feelings about His people and their attitude towards Him. He uses treacherously five times in 8 verses. We also find profane or profaning, abomination, and God saying He literally hates something.
Those two words alone, God and hate, should get our attention.
But what does God hate? Ah, that's where the "D" word comes in.