...since anyone can ignore the booing and get the original broadcast, same with the porno.

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).