Why not look at verses 28-29 in that chapter?
28 Then they asked him, “What must we do to do the works God requires?”
29 Jesus answered, “The work of God is this: to believe in the one he has sent.”
So, what did Jesus spend his time drilling into the people in this chapter?
5 Then Jesus declared, “I am the bread of life. Whoever comes to me will never go hungry, and whoever believes in me will never be thirsty.
and then the Jews said:
41 At this the Jews there began to grumble about him because he said, “I am the bread that came down from heaven.” 42 They said, “Is this not Jesus, the son of Joseph, whose father and mother we know? How can he now say, ‘I came down from heaven’?”
and then Jesus said “Stop grumbling.” And continued–
7 Very truly I tell you, the one who believes has eternal life. 48 I am the bread of life.
51 I am the living bread that came down from heaven. Whoever eats this bread will live forever. This bread is my flesh, which I will give for the life of the world.”
and then the Jews start arguing in verse 52 about “How can this man give us his flesh to eat?”
and then Jesus sez:
53 Jesus said to them, “Very truly I tell you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you. 54 Whoever eats my flesh and drinks my blood has eternal life, and I will raise them up at the last day. 55 For my flesh is real food and my blood is real drink. 56 Whoever eats my flesh and drinks my blood remains in me, and I in them.
and then the people say–
60 On hearing it, many of his disciples said, “This is a hard teaching. Who can accept it?”
and then Jesus sez:
61 Aware that his disciples were grumbling about this, Jesus said to them, “Does this offend you? 62 Then what if you see the Son of Man ascend to where he was before! 63 The Spirit gives life; the flesh counts for nothing. The words I have spoken to you—they are full of the Spirit[e] and life. 64 Yet there are some of you who do not believe.”
And then the people went all–
66 From this time many of his disciples turned back and no longer followed him.
So Jesus had so many chances to say, “Oh, I’m so sorry, y’all totally misunderstood what I was saying. Come back over here and let me try to put it a different way.” But instead, he doubled down over and over and over and over again— seven times, I think.
So it looks like your friend is falling into the category of people in verse 64. Because if Jesus takes the time to say a thing seven times in a row, and your friend decides to hop on one particular part of a verse that doesn’t even refer to what someone claims it refers to---- someone’s being deliberately obtuse.