Riots are illegal protests.

There are definitely illegal ways to protests.

The woke Marxist Antifa paramilitary proved that last time Trump was in office.

And the leftist controlled media practiced "Repressive Tolerance" which is when they oppress the thoughts and views of the right to the point that most people won't thing them, while at the same time extending tolerance to the left, even if the left is violent.

You can read all about Repressive Tolerance in the essay by Marxist Herbert Marcuse.

Is he refering to protesters, that are commiting violent acts? Or just protesters, that stay anonym?

Only strictly regulated Two Minutes of Hate are allowed.

He is referring to protestors disrupting Jewish classes and students.