Thorn was suspended for one match for an "act contrary to good sportsmanship" - a punishment the Springboks felt was too lenient - and will miss the return match against the Springboks this weekend in Dunedin.
Smit will also miss Saturday Test as well as the following Tri-Nations encounter against Australia in Perth after he flew home from Wellington on Wednesday.
"Just imagine Bakkies Botha doing something similar to Richie McCaw. World rugby would have come to a standstill," Smit told Supersport.
"Yes, I'm angry. I'm really not happy about having to sit in South Africa and watch the Springboks beat the All Blacks in Dunedin."
"One almost gets the idea that anyone who is not from New Zealand does not have same rights as someone who plays for the All Blacks," Smit said.
"I was suspended for six weeks after a Test match in France for running into someone with my elbow held in front of me. It was not nearly as nasty as what happened to me last Saturday.
"A few seasons ago, Graham Henry asked everyone not to tackle Richie McCaw. Now Richie is injured and Henry is asking everyone not to tackle Dan Carter."
Schalk Brits has arrived in Wellington as Smit's replacement, but Bismarck du Plessis looks set to be named as the starting hooker when De Villiers names his team on Thursday.