Okay, so you are going to play dumb?
Here it is in black and white.
"But when Peter was come to Antioch, I withstood him to the face, because he was to be blamed".
"For before that certain came from JAMES, (Judaizers) he did eat with the Gentiles, but when they were come, he withdrew himself and separated himself, fearing them which were of the circumcision" Galatians 2:11, 12.
James sent men to spy on Peter and Barnabas to see if they were eating with Gentiles. A definite no, no, for Jews that observed the law of Moses.
A Judaizer is one that believes in Jesus, but also believes that you must keep the law of Moses. James was a Judaizer at the time this was written. Peter and Barnabas also had a problem, Paul had to straighten them out.