"They can “boldly display” because they are free. Said another way: Without such ability to freely shove something controversial in “the leader of the free [world’s]” face, freedom would be a sham, and that person would not really be “leader of the free world.” Agreed, for the same reason that those trube blue patriot types who want to put people in jail for burning the flag or protesting are wrong.
That said, though, the freedom to pull that flag in front of the president only shows what those pulling the flag out are, a bunch of losers who never got over the ‘glory’ of the good ole days when blacks were either enslaved or might as well have been sigh. I hear there is a resurganc in the klan, and unlike past years they are now being treated, instead of with disdain like anyone of good conscience should, as some sort of relevant voice. And free speech doesn’t mean giving the morons who fly the confederate flag and whatnot a free pass, either, people should show them the disdain they deserve. Despite claims to the contrary, the good ole boys didn’t start with the confederate flag shirts and bumper stickers and flags until the 1950’s and 1960’s, which tells the truth to what it all was about.