He can call out anything he wants, but he doesn't have right to target people for deportation because he disagrees with their constitutionally protected speech.
Attack him politically the flaws in his policies, that's fine. But that's not what he's doing.
This is why are politics are so skewed toward the fringe, we accept and cheerlead stupid crap like this with partisan glee. You can't call out the opposite side for their hypocrisy and bad faith actions when you cheerlead it from your preferred party.
In short you are feeding the very thing you despise. If you cheerlead for your fringe the fringe on the opposite side gains strength and power. It works both ways and you slurp and feed it!