Sounds like this guy doesn't seem to care about his son much. I mean if it were my son I'd make sure to get the things he liked just so he could eat.

I'm a very picky eater, too, so I can understand your son's unwillingness to eat certain brands and things like that.

Sounds like this guy is unwilling to accept reality. Sure it would be nice if everyone ate everything they were given but that's not reality!

If he's willing to feed your son what he will eat, then I'd let him go. If not, then I wouldn't let him. Your son needs to eat. That's my concern.