An overly simplistic approach to free speech is naive and counterproductive in a modern environment. These aren't serious people having a reasonable discussion. They are propagandists on a psyop platform, design to sow discontent in our democratic structures.
The actual defense is proper education and healthy, welcoming, accepting society. That is harder to make and maintain than banning IPs, the western world by and large cheaped out and stopped caring since the 80s.
The type of boomer that's likely to fall for it? Probably not.
Absolute and true freedom of speech, with all its drawbacks and legal greyzones needs to exist.