Nope, can't be that because I punched him too. I even berated Legion repeatedly about keeping things back. :/
Then I really don't know why I didn't get the red and blue dialogue options. I still have a save file from before that sequence and when I checked it earlier I had a maxed-out reputation bar. The only thing I did wrong was reprogram the Geth heretics in ME2, but I did everything else right and therefore should have been able to broker peace. It must have been a glitch then. That sucks.