This isn't the bad part. Operant conditioning is how all behaviours are formed, if something gives a positive feeling or takes away a bad one the behaviour increases, if it adds negative feeling or takes away a positive one the behaviour decreases.

The issue with ABA is firstly trying to take a persons personhood away, teaching someone that who they are is bad, and secondly the mad schedules they impose. It might be that a person doesn't feel comfortable with eye contact, the ideal situation is we go "cool, don't do that" and everyone is just cool with it, a middle ground that is a good idea is to help the person get used to using intermittent eye contact or using little tricks like looking at someones nose or forehead. The ABA solution is we force the person to make eye contact for an hour a day, regardless of comfort, and witholding a comfort item, like a tablet, until they have completed that hour. It's treating a child (or sometimes an adult) as a non-entity, just an issue that needs to be fixed, needs to be 'normal'.