I fully understand Wiggins' position. Most in the sport and cycling media knew there was something in what Landis was saying - cycling culture during the era was well known about - but for Landis to come out in the way he did, after years of fighting to retain his win, just for whistle blower money and revenge on Armstrong for not being put on the team, was seen as pretty crappy. By 2010 the Armstrong wins seemed like a settled issue - why spoil it now and ruin the careers of so many other riders, so many fans around the world, just because Landis didn't like the comeback?
Landis was indeed acting very crazy on twitter, like the whole thing was a big game, which obviously went down like a lead balloon with serious professional people in the sport.
http://www.outsideonline.com/outdoo...ter-War-Against-Lance-Armstrong.html?page=all
Serious people feared this whole affair would overshadow the sport for years and do huge damage to its image. You'd have to say their fears have been vindicated. Three years on, the wreckage is ongoing and for very little gain. Given all the above context, you can hardly blame Wiggins and others for reacting like they did.
Lastly, remember too that Landis was claiming, without any knowledge, that Garmin was Postal mark 2 and that Wiggins was doping. Landis' wide smear brush severely annoyed a lot of people. The idea that everybody was going to rush to the aid of a guy smearing them and acting like an internet crank pot is fairly far fetched. Most of us would have done the same.