That is true. However, PPR rules prevent attacking people based on their political affiliations.
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While it is acceptable to attack and debate beliefs (political, religious etc) it is not acceptable to make generalised attacks on the adherents of those beliefs. It is acceptable to say that Republicanism, Liberalism, Christianity, Islam are stupid but not acceptable to make generalised attacks saying that Republicans, Liberals, Christians or Muslims are morons. You could say that some of these people are stupid because of (reason) but not make generalised attacks on groups of people. Similarly you could not say "Christians are morons" or "Muslims are terrorists" or "People on welfare are bums". Confine your attacks to the beliefs and politics, not the people holding them. The one exception to this is public figures themselves – by the very nature of their roles they are personally open to criticism.
You could say "if you care strongly about Brexit then it is stupid to vote Labour or Tory" for example, but not "Labour or Tory voters are stupid".