I think blacks are exempt from the rules. They did penalize the Asian 8th grader for timing out during his turn and Woods is half Asian, so.. Tough call.
At the same time that Guan was penalized a stroke for using 50 seconds on his second shot on 17, Tiger was eyeballing a putt for a minute and 32 seconds {but Tiger's group was not out of position}.
Slow play is one reason that I rarely play golf on the weekends.
During the week my foursome can zip around 18 in 3 hours and change, but on the week end that turns into 5 plus hours and our scores go way up because you can't concentrate that long between shots.