Honestly, I've never had a therapist nag me into meds, so maybe my contribution is entirely irrelevant. When I was on meds, it's always been as much as possible within my state of mind at the time an informed decision on my part (ie. I might now have made a different decision, but was at the time in such a state that I wanted to try everything to better my condition, including meds). The only bit of nagging into meds I experienced is with continuing on Risperdal (the initial prescription came from a psychiatrist who didn't nag me into it), from my GP, who was at the time sort of trying to help me with mental health stuff in the absence of a mental health provider. The reason was likely that she hadn't known me off meds, since I came into her care on meds, and she wasn't sure what would happen if I discontinued the med. But when I flat out told her that the question wasn't whether I would stop, but how, she did give me advice on a tapering schedule and continued seeing me without further nagging on meds.
The psychiatrist in charge of my current placement is pretty much fine with my not being on meds. He isn't my treatment provider, since that's a psychologist, but if he (psychiatrist) desperately wanted me to go on meds, he could easily suggest it. I currently don't even get nagged into using my PRN meds by nurses, which did sometimes happen at my former placement.
As a side note, what is the reason your former psychiatrists kept nagging you into using meds? I mean, there is little evidence that meds work for the primary symptoms of autism spectrum disorders, and I get it that the consensus among professionals specializign in ASDs is that meds should only be considered if appropriate ASD-related treatment/support doesn't have enough results.