It's not rude to interact with a person in public. As long as he didn't harass, and he respected the women's choice if they didn't want to talk, there's no harm done.
Many friends of mine have met their significant others through spontaneous interactions like this. It's not as uncommon as you'd think.
Why couldn't he get phone numbers from unattractive girls, or boys?
Are you serious? This is rather insulting to so-called "unattractive" girls.