It can be both, but let's not conflate it into one.
The hyperpartisans would have clear hypocrisy on this issue, no disagreement there.
I don't believe Mitch is a neonazi supporter nor a Milo supporter. He'd probably support their free speech rights, but that support would have limits. For example, if they were harassing Dems at their homes, restaurants and stalking them in public, i believe he'd condemn them.