I'd prefer my son does not grow up to be gay.
Why don't you want him to be gay?
Because it may get to be too much for me to handle.
Parents need to show love to their children regardless of their sexual preference. He would be really disappointed if you didn't support him in this.
It's a phase.
You need to be supportive of your son no matter what. Not approving won't change his preferences and it will just push you two apart.