In the following video, which was sent to us by Buzzfeed, you hear a few members of the Southern Miss band chant "Where's your green card?" as Rodriguez comes to the line. It needs to be pointed out that at this point we think it was just a few members of the band, and wasn't pre-planned. Just a sudden, random outburst of jingoistically-tinged insensitivity from some college kids wearing Southern Miss. shirts.
Also: Rodriguez was born in San Juan, Puerto Rico. Puerto Rico is an American territory, thus making him a US citizen. He doesn't need a green card.