My argument is rock solid based on FACT; your assumptions about "free speech" are based on your emotions, though yes, at many college and universities Trump supporters would be harassed at best and worse to happen to them, valedictorian or the lowest grade level in the graduating class. But THAT is NOT what this threads is about!
That's the argument leftists use when they keep conservatives from speaking on campuses. I get that here is a gray area in this argument but the answer, IMO. is more speech not less. And yeah, it's fine to boo, shout her down, turn your back on her during the speech or simply walk out.