1. Nobody would know that; you could've easily offended someone else. Being part of a group doesn't make it right to make fun of it, either.
2. It may not be mocked by the majority (arguably), but that doesn't make it right to, either. Some people identify with that. Perhaps not with the same zeal as some TV shows make out, but unlike in the past, many are practically brought up with games as much more than just a pastime.
3. It may not be mocked by the majority (arguably), but that doesn't make it right to, either. People have still been persecuted historically for holding certain ideas and beliefs, and I think that speaks enough for itself.
They're still jokes of the same nature I made before. Ironic claims. Ultimately they're either acceptable by nature or by what demographic they're aimed at. Up to you.
Just by the by, if I just happen to insult Richie Rich I don't think they'd give a fuck considering all they'd need to feel better was to squeeze their diamond encrusted stress ball and have a jolly old time swimming in their money pool.
Still doesn't make it okay. Sure, he's better off in the world than 99% of people, he has better odds of taking it, and he might have no reason to take it to heart, but that's still no reason to take it out on him. He's still a person, it's wrong, and it's a bad thing to do.
Trying to solve social issues by being more of a jerk to a selective group of people isn't going to do much. At most, you'll tip the scales and become the same thing as the supposedly bad people you're trying to denounce. And there's still going to be jerks all over the place.