IN one sense he is right — we have become much to accepting of divorce.
The Catholic Church does not accept civil divorce. It is why there must be a Church annulment that proves that the marriage was never valid in the first place.
Having said that, I do believe that the acceptance of divorce (generally speaking) was one of the precursors to the legalization of gay marriage. One part of the slippery slope that is the ruin of traditional families.