I don't think majority of Sri Lankan fans are bringing out the 'Race card' on this one rather than being nationalistic and sticking with their player hoping for the best, similar things happen all over the cricket regardless of the colour . Obviously there will be few ignorant people who will pull out the race card.
That Stuart Broad incident was a good example, a guy in our team who values spirit of the game did a complete U turn on his opinions to defend Stuart Broad incident saying it's umpires decision to give players out and all that.
As a Sri Lankan my self and many of other SL fans agree that his action looks bad to the naked so it has to get checked. But regardless the outcome he will be classed as a chucker for the rest of his career.
And you can't decide if a player chucks more than 15 degrees by watching on 2D image on TV, for example if the bowler keep the same bent on his arm but twists the arm from the shoulder then it looks like he has extended the arm on 2D view, but in reality he hasn't. So testing has to be done properly in a lab or with multiple cameras in match conditions. And many get this 15 degree rule mixed up, including past international players, It's the flex which is not allowed , you can bowl with your arm bent for 90 degrees is you want toas long as he keeps the same amount of bend at the point of delivery.
Plus it doesn't really help when people try to call the likes of Malinga a chucker , then it starts to look like they are being desperate and trying to call everyone a chucker.