Well, what did you expect him to do when the other side is yelling stupidities all the time? When did a presidential debater had to tell the other side "will you shut up, man?" and call him "this clown"? When they run out of patience when trying to play by the rules, and the other side doesn't.
Then, you see that a segment of the population is still sleepwalking into fascism. Not some "maybe" danger, actual danger (the contender tried to keep power by force, and yet he's the main contender?!) Venezuela went through this. Look up the Hugo Chavez story.
The first two minutes of the speech was practically him saying "WAKE UP, AMERICA!! See what's happening!"
It was about time.
The other side is a constant "NU-UH! NO U!!!" noise, and you felt "relieved" when Biden was speaking calmly?
I say, he should have used 80 more exclamation marks.