It’s reprehensible now, and with the information we have on hand. If his entire worldview was shaped around hating jews, which wasn’t uncommon among gentiles, then that statement is understandable coming from him at that time.
You need to separate yourself from being a 21st century, moral (at least in this case, I don’t know you), and critically thinking human being that can look in hindsight with centuries of lessons learned.
You just can’t do that because it will never hold up to today’s standards. In 500 years, putting cheese on bread might be seen as taboo, but you would think that’s ridiculous today. It doesn’t matter how serious or silly the topic is, the point is that it will never compare fairly.