Why are people so hostile towards me because I am autistic and did some stupid stuff in the past?

So I have been recently diagnosed with autism and I am 24 years old. When I was 16 I did something stupid and got my family estranged from one of my aunt and uncles. I took a dvd from my uncles house without asking and then lied and denied stealing it. My parents yelled at me over it so I started a whole arguement over this and lied about my uncle beating me up and filed a police report and got my cousins arrested. Years have past and we've now recently reconnected but there is still bitter and hostile towards me. I've changed for the better and I am a better person now. People are still bitter towards me over the whole situation. My cousin was recently talking to her sister about how I recently got diagnosed with autism and her husband butted in and said whatever happens to him he is not allowed to stay at my house cause he got me arrested under false pretenses and I am glad that karma got him back and got him arrested for unlawful use of telephone. I hate how he brought up about my arrest. The police thought I was playing around with the phone when I called for help cause I was suicidal and arrested me instead of getting me help that I need. I just don't understand why people are still hostile and have a grudge on me against this. I don't get why people don't believe me that I have changed for the better. Why are people like this towards me ?