So, had "right wing zealots" blocked President Clinton's limo at an appearance, you'd have been all right with that? You can't run any government like that. No one is saying they can't protest, merely that they had to stay in a specific area. Speech is limited in many ways. Your idea that all speech should be completely without any limits isn't realistic, no matter who the president is. Otherwise, we'd have to allow protestors to sit outside the window of the Oval Office 24/7.
The Secret Service under President Clinton closed Pennsylvania Avenue to traffic and also instituted a 2-day social security and name verification system if you want to take the White House tour. People were denied access to the White House(and probably rightly so) for security reasons. And frankly, that all seems pretty reasonable. It would seem your outrage is selective.