Wenger said something along the same lines after the QPR - Chelsea game, and I don't recall anyone slagging him off. I realise Blatter is President of FIFA but still, Wenger is a big name in football as well. Here's a paragraph from an article from the Independent:
"How much credit can you give to something that is said on the pitch in a passionate situation?" Wenger said. "How deep do you read?" He suggested, with a rather more trivial example than the one currently in the news, that insults on the football pitch are "reflexes" rather than considered speech. "If you have played football, you have said something to your friends sometimes that you are an idiot – but you do not really think that he's an idiot."
During a football career there are quite a few 'heated' situations. Sometimes people say or do silly stuff but I think as long as people can shake hands afterwards and apologise when an apology is due, then one shouldn't read too much into it. There's a difference between one nasty tackle and being a nasty player. However, if John Terry denies having said something racist during a game and it turns out he did, then I think he should get a ban. Professional athletes are paid vast amounts of money too, and probably should be able to keep it within the rules.
I don't like Blatter, but I think this particular hounding is over the top.
Link to article mentioned above:
Wenger offers words of comfort for beleaguered Terry