Again, this isn't what's happening. The rules are being applied equally to all drivers. You just don't like the rule.
An even better analogy would be that there's a rule against going above 60km/h for years, but for some reason the cops didn't enforce it. They suddenly decide to enforce the rule equally for all drivers on the road. One driver doesn't like it and has a hissy fit, and all his fans turn themselves in knots to try justify breaking a rule.
The end.
Actually, better analogy than that was that the rule was you could only go 50, but the cops allowed 60 for years, and even allowed the neighborhood's cars to be modified so that they physically could not go below 60. Then, after some rightful criticism has upset them, they decide to crack down on 50, without allowance for the cars that were modified under their discretion.
But in this case, the rule is nonsensical. A wedding ring is not magically immune from causing harm, and it's easy to see it's more likely to cause an injury than a nose stud in race conditions.
If a rule is badly written and nonsensically applied, it should be challenged. Anyone who knows me knows I'm about the furthest thing from a Hamilton fan there is. But in this case, I believe he's in the right.
Tonight we go out for FP3. Magnussen, Hulkenberg, and Perez will all be wearing rings. Hamilton will be wearing a nose stud. Somehow, only Hamilton is the one wearing jewellery, according to the FIA. There is absolutely no way that makes sense.