TL;DR: Harry Potter characters used to describe personality disorders in a medical lecture. Does describing some as villains increase stigma towards people with the condition?

I study medicine in the UK (currently 3rd year) and I recently attended an online lecture about personality disorders, run by an independent 'by students for students' lecture series. The majority revolved around which symptoms differentiate the different disorders, which was helpful enough, however the presentation of these conditions in the context of the webinar left me a little...uncomfortable. 

I can recognise that teaching about personality disorders tactfully can be difficult to achieve (and it's important to make teaching accessible for exams sake), especially for students who likely don't know a lot themselves, but even still I thought some choices were slightly suspect - specifically the decision to assign a Harry Potter character to each disorder. For the most part, I had no issues with how disorders were described with cluster A and C disorders typically coming across as troubled but palatable - victims of their conditions - with their assigned characters reasonably 'complimentary' - Luna Lovegood representing schizotypal, Snape schizoid, Hagrid anxious/avoidant .etc. When it came to Type B disorders (Borderline, antisocial, narcissistic), there seemed to be far less understanding. Especially with antisocial personality disorder, it was described as being for people who are manipulative, uncaring and untrustworthy - in short they are the villains. Appropriately, Voldemort was chosen to represent the condition. 

There remains a huge amount of stigma towards people with mental health issues throughout both the medical profession and society at large, which massively needs to change. This certainly isn't the first time I've felt like other medics look down on people with mental health problems. I find it hard to believe you can truly understand the complexities of someone with a personality disorder if your first thought is that they're like Voldemort. How would people have responded if they'd been part of that session, am I overreacting by feeling it's quite dismissive? In what ways would you change how teaching about personality disorders (and mental health conditions in general) is conducted to stop the stigma?