As an adult Aspie, I wish I could say that forms of mockery have disappeared, but only the more "blunt" forms such as a peer saying in front of an audience "this is my impression of Jayo" - then putting on an exaggerated AS show...that was well before my diagnosis at 27 though. Now, in my 30s, it tends to be the odd person, maybe 5% of people, who have reacted to with more subtle mimicry of my symptoms.
For instance, a manager at my old workplace would feign misunderstanding of what I told her, yet I would repeat the same scenarios to somebody else and they understood perfectly. This woman would constantly interrupt me with "when you say X, do you actually mean Y?" sort of like I do sometimes, only I do it legitimately. So, I would reply with "Yes, that means Y." Then she would say "OK, well you didn't EXPLICITLY tell me that. So when you communicate that to somebody else, they will misunderstand you." She did this regularly, but she would only do it in one-on-one conversations, not when others were present - so I figured her tactics out. I understand enough about facial expression through regular counseling (following my diagnosis), that her expressions of confusion sometimes appeared forced or fake.
She would also ask me to write down on a piece of paper or board concepts that seemed very simple - exaggerated, passive-aggressive style - sometimes I do ask people to sketch things out due to short-term memory and processing issues with synthesizing info, but not as frequently as she did. She also asked me to book 1 hour long meetings with her in a meeting room over subjects that could relatively easily be resolved. Again, I only noticed this pattern with her. And I know she wasn't AS, because she was highly extroverted, she was high on office politics, and as I said, she wasn't like this when multiple people were in a meeting with us.
In my view, her behaviour was more insidious than the goofball who uses blunt force imitation & mockery to get a reaction out of me or an audience. Many times I thought about calling her game out with evidence that she was imitating me with exaggerated (yet subtle) mockery, but who am I kidding, she would flatly deny it and I'd look even more mentally unstable.
I certainly hope very few of you had to deal with this insidious treatment, but feel free to spill your thoughts out either way!!