I want to begin by thanking PeanutHut for accepting this debate and I wish to extend him a warm welcome to DART. With that, let's get started.
I. Criteria of a False Prophet
Deuteronomy 18:21-22 (NRSV) establishes the criteria for a false prophet:
21 You may say to yourself, “How can we recognize a word that the Lord has not spoken?” 22 If a prophet speaks in the name of the Lord but the thing does not take place or prove true, it is a word that the Lord has not spoken. The prophet has spoken it presumptuously; do not be frightened by it.
Thus we can establish a valid syllogism as followed:
P1: Anyone whose prophecies fail to come true is a false prophet
P2: Jesus' prophecy about his return failed
C1: Therefore, Jesus was a false prophet.
II. What Jesus Prophecied
24 Then Jesus told his disciples, “If any want to become my followers, let them deny themselves and take up their cross and follow me. 25 For those who want to save their life will lose it, and those who lose their life for my sake will find it. 26 For what will it profit them if they gain the whole world but forfeit their life? Or what will they give in return for their life? 27 “For the Son of Man is to come with his angels in the glory of his Father, and then he will repay everyone for what has been done. 28 Truly I tell you, there are some standing here who will not taste death before they see the Son of Man coming in his kingdom.”
There are several points to note here:
(1) Son of Man will return
(2) Repay everyone for what has been done
(3) Some will not die before this happens
It should be obvious that all three parts of this prophecy failed. Some have taken this to mean that Jesus was prophecying about his transfiguration, which took place in the next chapter, but this cannot be as "he will repay everyone for what has been done" did not occur at the transfiguration.
32 “From the fig tree learn its lesson: as soon as its branch becomes tender and puts forth its leaves, you know that summer is near. 33 So also, when you see all these things, you know that he[g] is near, at the very gates. 34 Truly I tell you, this generation will not pass away until all these things have taken place. 35 Heaven and earth will pass away, but my words will not pass away.
Jesus foretells of his return within that generation. This too has failed. Many Christian apologists have been disturbed by these failures and have attempted to make rescue devices to save face. The NABRE admits:
The difficulty raised by this verse cannot be satisfactorily removed by the supposition that this generation
means the Jewish people throughout the course of their history, much less the entire human race. Perhaps for Matthew it means the generation to which he and his community belonged
The NET Bible, 2nd edition, notes:
sn This is one of the hardest verses in the gospels to interpret. Various views exist for what generation means. (1) Some take it as meaning “race” and thus as an assurance that the Jewish race (nation) will not pass away. But it is very questionable that the Greek term γενεά (genea) can have this meaning. Two other options are possible. (2) Generation might mean “this type of generation” and refer to the generation of wicked humanity. Then the point is that humanity will not perish, because God will redeem it. Or (3) generation may refer to “the generation that sees the signs of the end” (v. 30), who will also see the end itself. In other words, once the movement to the return of Christ starts, all the events connected with it happen very quickly, in rapid succession. 
These are certainly creative solutions that don't line up with the text.
Jesus' prophecy about his return failed, hence Jesus is a false prophet.