Indeed, and those many who did not "receive" His teaching muttered: "This is strange talk, who can be expected to listen to it." And Jesus answered: "But there are some, even among you, who do not believe." 

Similarly, His disciples struggled to accept His teachings on divorce and remarriage too, saying: "If this is the case it is not expedient to marry." Jesus replied: "Not all men can receive this saying, but they to whom it is given .... He that is able to receive it, let him receive it."  Meaning - as a follower of Him, understand what marriage entails before entering into this life long commitment.

Yes, Jesus set the bar high, regardless of  "lived experience" and His disciples despaired said:  "Who then can be saved?"  Jesus answered: "With men this is impossible; but with God all things are possible." 

As relevant then as it is now. He didn't modify the Law of His Father to accommodate human weakness and sin. He offered the gift of the Holy Spirit.