As far as mental disorders, I think the most common in people with autism are depression, social anxiety disorder, and various personality disorders. As far as other mental problems, I'm referring to things like cognitive distortions, negative attitudes, looking down at others, stubbornness, self-absorption, self-hatred triggering emotions in response to constructive criticism, and heightened emotional sensitivity in general. Of course, not everyone with autism has all these problems and it's likely that everyone without autism has some type of mental health problem as well since no one is perfect.
I posted my response because I used to think people disliked me because I was autistic but later realized it was due to mental health problems that were within my power to change. After working to overcome those mental health problems, people respond more positively to me, like me more, and treat me better which makes it much easier to get along with others.