Really sorry to hear that! I was in a similar situation a few months ago where my co-op supervisor disagreed with me and I was close to failing (luckily I passed), but the day to day stress on my mental health was insane.
I think that UBC will throw out your worst year like was mentioned above and because it is just one course it wouldn't look as bad, especially if it seems to be an outlier. There are also other medical schools in Canada (OMSAS) that you may have a decent chance at as they look at selective years.
Keep your head up and get through this!