All scripture “must be Spiritually discerned”. John 6 is no different. What mustn’t happen to it, it must not be ignored, under that pretext or any other.
For me, John 6 is exceptional in this regard because it gives insight to the body and blood before the commandment given at the Last Supper and also because of the reaction of the disciples, i.e. many of them couldn't bear it and walked away.
John 3 (born again) is also exceptional to me because of the bewilderment of Nicodemus and the repeated emphasis by Jesus.
Of course we know that Christ spoke in parables to hide Truth in plain view. But these two passages are not parables.
Both passages are speaking of Spiritual, timeless, realities which are not logical or rational to the mortal mind. Hence, the revulsions.
Sometimes I assert these two passages to those who claim that all of Scripture can be interpreted by other Scripture - which is to say, by mental reasoning comparing Scripture to Scripture because metaphors are defined in Scripture.
Without disputing either interpretation, I assert that the Lord's Supper is mentally deduced from Luke 22:19 and I Cor 11:24-25 et al - and that the Eucharist is additionally mentally deduced by John 6.
But Spiritual Truth is obtained by revelation; mental reasoning cannot uncover it. For me, Spiritual revelation is Truth, it alone is reliable - whatever mental reasoning I might have is subordinated to it.
In this case, the Spiritual revelation I have received is that we are to consume Jesus Who is the bread of life. We are to take in the Living Word of God. He is our life. (John 6:32-63, Matt 4:4, John 15, Romans 8, John 17, I Cor 2, et al)
Nevertheless, not every Christian is given to the exact same Spiritual understanding and/or emphasis of Spiritual revelation. That itself is part of the beauty and mystery of the body of Christ.
Praise God!