Are you familiar with the saying, "your freedom to swing your arms ends at my face"? *
A primary function of Freedom Of Speech is to protect the people's right to criticize their government.
Now imagine, that a government (or one of its individual agents) broadcast loud booing OVER the soundtrack of any media it found critical.
This would be de facto censorship, not free speech.
The point of this hypothetical is to place the government in the position of the SJW.
(IFF) it's ok for an SJW to air-horn Ben Shapiro in person (THEN) it's ok for a government (or corporation) to air-horn anti-government speakers.
Interesting side-note. There has been some research into speech-jamming technology which could be used to silence speakers at large rallies (like Martin Luther King jr. for example) and it has the added bonus of making the speaker look like an idiot (potentially destroying their credibility).