For those who have an interest in truth I will repeat the official and, I believe, entirely reasonable Douay Rheims explanation of the apparent discrepancy.
(Douay Rheims) Psalm 68:6 O God, thou knowest my foolishness; and my offences are not hidden from thee:
(Footnote:) [6] "My foolishness and my offences"... which my enemies impute to me: or the follies and sins of men, which I have taken upon myself.
Psalm 69 is written by King David, who is writing his earnest prayer to God, based on his own experiences. However, King David prefigures Christ, and so his prayers weren’t mere prayers, but had prophetic significance. However, in transferring the relevance from David to Christ, what was physically real in reference to David becomes spiritually real in reference to Christ:
Whereas David was referring to actual sins, when Psalm 69 is understood as referring to Christ, we must understand that it refers to those sins imputed to him. Likewise, 69:8 (which already uses figurative language) refers not to actual sons of the speakers’ mother, but to the children of Israel, who did not recognize Jesus’ divinity or authority.
James, “the brother of Jesus” is in Luke 6:16 identified as the brother of Jude, (not to be confused with James, the son of Zebedee and brother of John.) James and Jude are “of Alphaeus,” not of Joseph or of Mary or of Bethlehem or of Nazareth or of Capernaum.
Mary of Clophas was “of Alphaeus.” This Mary was the Blessed Virgin Mary’s sister (John 19:25). (I always presumed this meant “sister-in-law,” but I’ve been told that sisters then could share a first name.) Hence, we can reasonably know that James and Jude the disciples were in fact first cousins of Jesus.
As for “resorting to typically juvenile insults,” it is ironic that OLD REGGIE is name-calling, posting silly pictures and referring to Cronos’ correct argument as “loud stupidity.”