A.T. Robertson Commentary 2 Corinthians 11:18

"Seeing that many glory after the flesh, I will glory also." — 2 Corinthians 11:18 (ASV)

After the flesh (κατα σαρκα). It is κατα σαρκα not κατα Κυριον.

I also (καγω). But he knows that it is a bit of foolishness and not like Christ.