Bullshit. Williams didn't voice a generalized opinion of a group. He absolutely did NOT say that in his opinion all Muslims are terrorists. He simply said how he personally FELT in a specific situation. You're trying to twist what he said into something he did not say.
Some more than others. The fact that the Tea Party miraculously coalesced a mere 32 days after Obama's inauguration, whereas there was no such collective peep beforehand despite the ongoing and rampant fiscal irresponsibility, makes them all assholes in my book.
...regarding an entire group of people. Perhaps he should have been able to express his opinion. But let's acknowledge it for what it is.