Another parent abused my spouse while dropping off our kid

An incident happened this morning that I'd like to get your opinion on.

While dropping of my preschooler, apparently my wife took a parking spot, which apparently another parent was waiting for. Per my wife's account, he didn't have his blinker on so there was no way to tell if he was just idliing or waiting on the spot.

What happened next was the dad of the preschooler road raging on my wife, and going on an expletive filled misogynstic rant, which is not even appropriate to share here. He goes into the preschool, following my wife and in front of the other parents, calls her names while she was helping my preschooler put his stuff in his cubby.

Now, we feel intimidated, and not safe, and looking for advice on how to proceed. This is a man she'll need to come face to face everyday. He apparently called a B**** in the parking lot, and a C**** inside the bldg