Barstool Sports founder Dave Portnoy said Monday that he thought the anti-Semitic sign at the Philadelphia bar on Saturday night was probably a joke, but the offensive performance was nothing interesting.

"If I hadn't seen it in a bar I owned, maybe it wouldn't have shocked me," Portnoy told NBC News. "But the increase in anti-Semitism is obvious."

He was angry about it and promoted accountability. He said two women delivered signs on a crowded table on Barstool Sansom Street in the heart of Philadelphia. The server has not been determined yet.

Customers ordered bottled service as well as custom logos. It is not uncommon for bars to offer personalized signs for orders with bottles.

A student at Temple University, 2 miles north of Portnoy’s bar, was placed under a temporary suspension for alleged involvement in the incident. The university says this is under investigation.

However, Portnoy said it is not clear whether the server or the client who ordered the flag really contained a sentiment of hatred. He described the motivation behind the logo as "just pure stupidity."

Portnoy said he spoke with two clients involved in the order and asked: “What are you thinking?

“What’s going on on Barstool Samson Street is no joke; it shows the anti-Semitism of increasing normalization of public spaces,” said Vladislav Khaykin, executive vice president of the Simon Wiesental Center in California at the Forbearing Museum House.

Khaykin continued: "This incident highlights the acceptable level of laughing at Jews. We thank the business owners for taking action quickly. One of the reasons we see so much hatred offline is because there is a lot of unrestricted hatred online."

Portnoy, 48, said critics mistakenly portrayed him as lack of proper alerts. He visited the Auschwitz concentration camp and memorial to two clients involved in the Polish incident and learned about the Holocaust.

Portnoy vented on social media late Monday, posting a video where he said any responsibility for the sign was withdrawn by a client involved in the incident. Portnoy said he would no longer go to Auschwitz concentration camps.

"I hate dealing with this incident," Portnoy said in the video.

Some Jews criticized Portnoy, describing the characteristics of Auschwitz as a "paid holiday" to cause bad behavior. However, he retorted: “If you are following on this trip, it’s hard not to come back and feel differently about the issue.”

Portnoy is no stranger to making headlines, but the recent attention may be more personal. He said some changes have taken place in the American social climate, which almost normalized anti-Semitism.

He said: "It feels like I'm annoying, really doesn't..., it's creating an insecure atmosphere for people. You're talking about me, my parents, my family. Like, do you even know what you're talking about?"