Free Speech and the consequences thereof

Certainly Roseanne Barr is free to fire up any racist rant on her twitter account.  However, she is also liable for the consequences; in this case the cancellation of her hit reboot of the old Roseanne show.  In the days before social media on the internet became a thing, racists like Barr could offer up comparisons of black women with apes and then deny it if anyone called her on the comment.  Now, with screenshots capturing the tweet for posterity, even deleting the offensive reference does not provide deniability.  The intriguing question is how the tweeter in chief seems to remain immune to the consequences of his internet blathering.