OP, I think you need to take a look at your own judgemental attitudes - you're the one saying you'd look down on others if you knew they'd met online!
It is completely normal now for people to have met their partners online, whether that is through dating websites or more general sites and forums. I met my DH via mutual love of an obscure band on MySpace ages ago, and we are totally well-matched, adore each other and have a wonderful DS. Out of all my friends who are in relationships, the majority met online in some way. I know of two couples who fell in love via liking each other's comment on the Guardian website.
Many years ago, and when people didn't get much chance to be alone with someone of the opposite sex, never mind be intimate with them, many people fell in love by writing letters to each other and finding out who the other person truly was, inside. I see the way that many couple fall in love, myself and Dh included, as a modern version of that - by getting to know one another via email, msgs, even instant messenger, it can be a true meeting of minds, of kindred spirits.
I think it's actually very romantic to have fallen in love online, and actually quite sensible too - learning about someone via their words, and how they communicate and present themselves is a more rounded way of discovering if someone is right for you than drunkenly snogging the face off some bloke outside the pub at the end of Saturday night (not that there's anything wrong with that, either).
Surely the point is that you meet someone who is right for you, good to you, whom you can build a happy family with (if that's your choice, and it's possible), and have a good life with, not how and where you met them? It's incredibly shallow to care about that other stuff.
(Also, when someone is telling people how they met their OH, most people aren't listening that much, they're just waiting to tell their own funny 'how I met my Oh story, anyway!)