This is dramatically put, but it's not wrong. Reagan did support the apartheid regime in South Africa. See here.
I won’t even talk about his international behavior. I mean, it was just abominable. I mean, if we gained our optimism by killing hundreds of thousands of people in Central America and destroying any hope for democracy and freedom and supporting South Africa while it killed about a million-and-a-half people in neighboring countries, and on and on, if that’s the way we get back our optimism, we’re in bad trouble.
Of course, before some readers take severe umbrage let me acknowledge that there were other aspects to the Reagan foreign policy that Chomsky does not mention here. Reagan did reach agreement with Gorbachev in 1987 to remove intermediate-range nuclear missiles from Europe. Reagan did give his so-called "Ivan and Anya speech" (Google it) in 1984 in which he talked about the danger of nuclear war, and he did take certain steps on arms control. (Don't forget the Stars Wars boondoggle, however.) But on balance, Reagan's foreign policy was not something to cheer about, and that's putting it mildly. (His other policies were bad, too.)