I Googled, and found an article that said this:

in 2005 McMillan had a specific idea of who was to blame for the rent being, well, too damn high:

There are over (25) Twenty Five Thousand Newly Rented Apartments, Available, Now Renting in the Williamsberg Section of Brooklyn, NY. as is all throughout the (5) Five Boro’s. But… they are only being Rented to the Jewish People.

Which certainly seems antisemitic. I tracked down that claim to a Gawker article from October 2005 which said the above quote came from his website. It was hard to track down because all the news orgs link to his website's homepage which substantially changed multiple times since then and eventually stopped existing entirely, and it wasn't very easily navigable at the time. But here's the page being cited. It's…pretty fucking wild.

Here's his rather weak apology from 2010.

.

What he said wasn't dumb. Rent is too damn high. The reason he thought rent was too high was dumb and antisemitic.

Found the landlord