What do you say to your homophobic dad?

For example, how would you respond to an email that says (in part) this:

There is a big difference  in a relationship  between the gay  and the traditional,it’s what comes after( children ) ,it’s human nature even wild animals , to look after their young,( to provide food and shelter/ all the necessities etc ,)  With the children in tow, they have to realize  to have to work to set up and run as a family , no more fooling around.
 
It’s obvious the gay relationship will not end up with  this kind of headache , so it’s party time every day,and it’s easy to find target of interest when you are young and full of energy/desire ,relationships don’t last , the possibility of contacting serious diseases prevail . It’s no wonder  gay men would general die young before their time.

I believe my dad isn’t aware of how his beliefs are actually hurtful and offensive to others (ie. me), so I patiently explained how his words weren’t very nice, and how his outdated, stereotypical beliefs were wrong.

My dad was responding to a personal essay I wrote about what it means to win people back after a relationship. I included some anecdotes in the essay about my father’s experiences trying to win my mom back, as well as my own. He had this to say about my piece:

You don’t need me to tell you that this essay can only be found in the gay magazine and newspaper

Well, I didn’t need him to tell me because, quite frankly, it’s not true. I know it isn’t. Anyway, I’m pretty sure I have a better picture of the publishing industry than he does. Also, and more importantly, most people, especially in Vancouver, are a lot more open to diversity than him.

How would you respond if you got this email?