Hasan attended the DNC as a news reporter, not as a supporter of the Democratic Party. Left leaning news outlets such as Democracy Now (Amy Goodman) and Drop Site News (Ryan Grim and Jeremy Scahill) were also at the DNC. Even right wing outlets like Fox News and Newsmax were at the DNC. Even cranks like Charlie Kirk and Mike Lindell were allowed into the DNC.
Hasan also interviewed the representatives of the Uncommitted Movement outside of the DNC on the same day as being kicked out and marched with the Pro-Palestinian protests 2 days before.
He was critical of Kamala the entire 3 days that he was at the DNC. There were many people who asked him if he would support Kamala and he told them that he was waiting for her to show a change in the US policy towards Israel/Gaza before he was willing to show any support for her campaign. I think he might have told people to support Kamala if she had stopped weapon shipments to Israel and forced Israel to do an actual ceasefire. He also has said that he wanted her to have a different border policy than Biden. Kamala's border policy is very bad.
Hasan was being interviewed by a journalist from the New York Times when he was kicked out. The DNC had given him a private room to stream. Around this same time, Hasan tweeted that the DNC was doing hasbara. Some person walked in and said they were revoking his access to the room and they did not offer him any other similar space to stream. He canceled the interview with Shawn Fain of the UAW and went back to his hotel room.
At his hotel room, after being kicked out from the DNC, he reacted to Kamala's speech and said that he now believes there is no chance Kamala will change her policy towards Israel/Gaza. A few reasons cited were that the DNC did not allow any Palestinians to speak, Kamala said she wanted America to have the most lethal military in the world in her speech, and because they kicked him out for criticizing Israel.