I loathe Trump. Would have voted for virtually anyone over him. I voted against him, not for Harris.
My decision to leave the Dem party goes back at least two years when the Florida Dem party put up Charlie Re-Tread Crist in the gubernatorial race v. DeSantis. I did not vote on that line. Have been annoyed for more than that cycle at the state party's ineptitude.
When the Dems went with Harris with pretty much no even hint of consideration of anyone else, that was the straw, given how off-putting she was. My enthusiasm for her was occasionally boosted by her debate performance versus numnuts, for example, but in the end I just think the Dem party is too far left for me on too many issues such that I'm more accurately NPA.
That I still hate Trump and think him a con man does not make me a Dem in perpetuity.