The “King of the Hill” voice actor who was shot and killed, allegedly by his neighbor, had a bitter feud with the man for several years … and it had nothing to do with homophobia, neighbors say.

Here’s the deal … hours after TMZ broke the news Jonathan Joss had been killed Sunday during an altercation on his San Antonio property … the actor’s husband, Tristan Kern de Gonzales, said on Facebook the shooting was a hate crime — as homophobic slurs were allegedly hurled by the suspect at the scene.

However, neighbors tell TMZ … they did NOT hear anything homophobic said in the moment of the intense fight, and they say Joss and suspect Sigfredo Alvarez Ceja have been locked in a bitter feud for years — neighbors blaming Joss’ “antics” for disturbing an otherwise quiet, peaceful block.

Neighbors, we’re told, perceived these episodes of rage as a mental breakdown … and they told us that Joss, on more than one occasion, would apologize the next day after a meltdown.

The information we were given seems to track with what law enforcement has been told about the situation … San Antonio Police on Tuesday said thus far, they have found no evidence the shooting was a hate crime.