I don't really have a grand opinion on this. I'm happy for Caitlyn Jenner and the transgender community, and I'm not completely upset with his response. I've seen and heard worse. If it's something he doesn't understand or want to, I would just give him and much of the world time.
New things in the media to those uneducated and not normally open to it in the first place are going to face negative backlash- they'll be treated as trends or things made for attention because they are garnering just that- attention. Not that it's a bad thing- best thing is to award someone who is delivering the word transgender to many unknowing households. That's impact, and I think that is deserving of recognition.
Yes, the term transgender has always been out there, but the portrayal of transgender as something comical or sexualized, more so- and that might be because the reality of the term and the lives that we live have always been imagined, and not actually talked about.
Of course his comments aren't very helpful, it's just created from ignorance. He doesn't sound like a hateful man, just uneducated.