You don't find the source credible because it doesn't fit your biases.Sorry, I don't consider this a credible source. More just someone that wants to put their own narrative on the situation to suit their purposes.
I lived in Wichita Falls, TX for 6 years. There was plenty of blatant racism and homophobia as well as under the surface institutional racism/sexism/homophobia. It is not a place I would EVER want to move back to. It is definitely not a place I would ever want to raise a child.
I tried watching King of the Hill but was offended by what I saw and the complete dismissal of racial and homosexual hate as well as many other Texas hidden truths. Maybe I didn't watch enough, but I doubt it. The redneck Texans that I was exposed to were nothing like KOTH.
I don't have any clue about who Jonathan Joss was and never would have had an idea of what shows he was in if it weren't for this thread. Being murdered by a homophobic neighbor in Texas and the local police not wanting to call it a hate crime does not surprise me one bit.
In Texas if you shoot "someone" in your front yard the proper response is to call the local sheriff... to help you drag the body over the front door threshold so you can claim self defense.
Wichita Falls is hundreds of miles from San Antonio. San Antonio is a blue city and doesn't really fit the "racist homophobic redneck Texan" stereotype you're harping on.