Gal 2:10   Only they would that we should remember the poor; the same which I also was forward to do.

     Many Christians of the time were cast out of their homes for their belief on Jesus Christ as Messiah, and they lost most everything they owned. This verse especially applied to that situation of the day, but still not to be forgotten by us in the present time. God's Law directs us to always help the poor. That part is not done away with, and it applies to all peoples, not just one group among themselves.

 

Gal 2:11   But when Peter was come to Antioch, I withstood him to the face, because he was to be blamed.

     God revealed to Peter a vision of wild game upon a sheet, and our Father told him to take and eat. These meats shown to him were unclean according to God's Law. The meaning of the vision was revealed to Peter when he was summoned by God to the house of a Gentile named Cornelius, where many were gathered to hear The Gospel of Christ. The Holy Spirit fell upon them as Peter, a Jew, preached to them, and they were baptized in Christ also;

 

 Acts 10: Read All.

 

Peter then realized that Salvation through Jesus Christ was to the Gentile also and that was the meaning of God's vision to him. When Peter came to Jerusalem, other Jews had reproached him about entering the house of a Gentile, which was against their law, and he explained to them what God revealed concerning Salvation for the Gentiles.

 

 Acts 11: Read All.

     So Peter well knew from God that the Gentiles, who believed, were to be treated as brethren in Christ.

 

Gal 2:12   For before that certain came from James, he did eat with the Gentiles: but when they were come, he withdrew and separated himself, fearing them which were of the circumcision.

     Peter was there among the Gentiles at Antioch with Paul.  He freely ate and fellowshipped with those Gentiles. But when 'certain' Jews of James' group at Jerusalem came to Antioch, Peter separated himself from those Gentiles, because of what his own Jewish brethren might think or say. In other words, Peter was trying to be a 'man pleaser', instead of holding to the vision and work God worked through him concerning the Gentile being accepted unto Christ also. Peter would even say among those first Gentiles back in Caesarea who received Christ...

 

Acts 10:34. "Then Peter opened his mouth, and said, 'Of a truth I perceive that God is no respecter of persons:’

 

 

Gal 2:13:   And the other Jews dissembled likewise with him; insomuch that Barnabas also was carried away with their dissimulation.

     The word 'dissimulation' is 'hupokrisis' in the Greek meaning 'acting under a feigned part, ("hypocrisy")' (Strong's no.5272).
     We could speculate that them there Gentiles might have been eating country ham for dinner. Good ole' salt cured pork. Maybe even with home cooked biscuits and 'red-eye' gravy made from the