"Save Yourselves from This Untoward Generation."

It wasn't just 'any ol' generation'. Although what he's drawn from the passage has much truth ,William Mason was not following the first rule of scripture interpretation:

"The Scriptures are to be taken in the sense attached to them in the age and by the people to whom they were addressed."

 

Instead of 'untoward' there are better word choice such as :
corrupt
perverse
crooked

 

29 For I know that after my death ye will utterly corrupt yourselves, and turn aside from the way which I have commanded you; and evil will befall you in the latter days; because ye will do that which is evil in the sight of Jehovah, to provoke him to anger through the work of your hands. Dt 31
5 They have dealt corruptly with him, they are not his children, it is their blemish; They are a perverse and crooked generation.
20 And he said, I will hide my face from them, I will see what their end shall be: For they are a very perverse generation, Children in whom is no faithfulness.
21 They have moved me to jealousy with that which is not God; They have provoked me to anger with their vanities: And I will move them to jealousy with those that are not a people; I will provoke them to anger with a foolish nation. Dt 32

39 But he answered and said unto them, An evil and adulterous generation seeketh after a sign; and there shall no sign be given it but the sign of Jonah the prophet:
41 The men of Nineveh shall stand up in the judgment with this generation, and shall condemn it: for they repented at the preaching of Jonah; and behold, a greater than Jonah is here.
42 The queen of the south shall rise up in the judgment with this generation, and shall condemn it: for she came from the ends of the earth to hear the wisdom of Solomon; and behold, a greater than Solomon is here.
45 Then goeth he, and taketh with himself seven other spirits more evil than himself, and they enter in and dwell there: and the last state of that man becometh worse than the first. Even so shall it be also unto this evil generation. Mt 12

33 Ye serpents, ye offspring of vipers, how shall ye escape the judgment of hell?
34 Therefore, behold, I send unto you prophets, and wise men, and scribes: some of them shall ye kill and crucify; and some of them shall ye scourge in your synagogues, and persecute from city to city:
35 that upon you may come all the righteous blood shed on the earth, from the blood of Abel the righteous unto the blood of Zachariah son of Barachiah, whom ye slew between the sanctuary and the altar.
36 Verily I say unto you, All these things shall come upon this generation. Mt 23

2 For these are days of vengeance, that all things which are written may be fulfilled.
23 Woe unto them that are with child and to them that give suck in those days! for there shall be great distress upon the land, and wrath unto this people.
24 And they shall fall by the edge of the sword, and shall be led captive into all the nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.
32 Verily I say unto you, This generation shall not pass away, till all things be accomplished. Lk 21

"Save yourselves from this crooked generation" is reiterated here:

4 And I heard another voice from heaven, saying, Come forth, my people, out of her, that ye have no fellowship with her sins, and that ye receive not of her plagues:
5 for her sins have reached even unto heaven, and God hath remembered her iniquities.
6 Render unto her even as she rendered, and double unto her the double according to her works: in the cup which she mingled, mingle unto her double.
24 And in her was found the blood of prophets and of saints, and of all that have been slain upon the earth. Rev 18

 

You think those to whom Peter was addressing understood ‘this generation’ to mean ‘all mankind’?

"The Scriptures are to be taken in the sense attached to them in the age and by the people to whom they were addressed."

 

I guess from that perspective you can totally disregard any significance of 'audience relevance' in the scriptures, and apply anything to anything. Anything goes. Never mind the fact that there's an element of 'reading other people's mail' when you read the Bible.

I had thought more highly of your biblicism Ken.

 

Nope. I'm saying 'audience relevance' is essential to correct Bible interpretation. Don't try to twist my words. Again, I had a higher opinion of you than for you to do that.

 

Biblicism Definition & Meaning - Merriam-Webster