Perhaps Canadian border officials should deny him entry to Canada.  As a purveyor of hate speech that would be an option.

Per the Immigration and Refugee Protection Act:

Inadmissibility

Rules of interpretation

33 The facts that constitute inadmissibility under sections 34 to 37 include facts arising from omissions and, unless otherwise provided, include facts for which there are reasonable grounds to believe that they have occurred, are occurring or may occur.

Security

34 (1) A ... foreign national is inadmissible on security grounds for
...
(b.1) engaging in an act of subversion against a democratic government, institution or process as they are understood in Canada

(d) being a danger to the security of Canada