Well, the thing is: Contador, for instance, has only been banned for a poxy bit of clenbuterol, rather than any blood doping or EPO. And yet, practically every Contador "fanboy" cheerfully acknowledges that he has performed doped up to the eyeballs, based on many of the same reasons that they are sure Froome is doped now. The reason why fanboys of these other riders accept their obviously dodgy performances are almost certainly doped rides, and the Froome fanboys do not is because for the most part the Froome/Sky fanboys are naive blow-ins to the sport, or motivated by blind patriotism, while the fans of other riders have usually actually watched the sport for a while before becoming fans of a particular guy.
I do agree on the excessive personal venom though. Many forum members here do seem to watch all cycling in a constant state of barely suppressed fury.
I would have to be described as a Contador fanboy, but I quite like Froome as a rider. I think he is an entertaining and aggressive racer. I would have been quite happy to see him win the tour, if he didn't have an obvious devastating advantage over an obviously clean(ish) peloton. The fact that he has forced me away from the race threads and into the Clinic is my biggest gripe with the guy...
Were I do have issues, it is with Sky as a whole - I hate everything they stand for. But that's more of an ideological issue....