Someone must've told him that you were interested in him and he felt the need to give you his input without verifying it. Maybe someone told him that you gave him a rating he wasn't pleased with? All in all, I would assume someone told him something negative coming from you. It may or may not have been true, of course. Don't let it get to you.
I think maybe someone took his phone and decided to cause some issues by sending you that. I think you should ask him about it..maybe calling so you can hear the voice, rather than text, cause you never know if its someone else behind the phone that will be texting back.