It's part of the healing process.
Denial, anger, bargaining, depression, and acceptance.
Many of us are at the acceptance stage. We accept the team is bad and we need to suffer a while as part of the rebuilding process. Getting excited about a win only makes the inevitable losing streak more painful. It's easier to not care.
The real enemy isn't hating the team, the real enemy is indifference. Those are fans the team will have to win back. The haters are still engaged.