If 5% of the people that voted straight party ticket voted republican (a positive number of people), and 20% of the people that voted single candidate voted for Trump (a positive number of people), you would get 5%-20% = -15% difference. The -15% is not how many people voted, as that number is still positive, its just the difference in % of the 2 catagories.
Guy is also claiming Trump got negative votes around 4 minutes, he clearly doesn't understand the graph he's looking at.
If Republicans get 5% of the vote, and Trump underperforms them by 20%, how many Votes did Trump get?
If 5% of the people that voted straight party ticket voted republican (a positive number of people), and 20% of the people that voted single candidate voted for Trump (a positive number of people), you would get 5%-20% = -15% difference. The -15% is not how many people voted, as that number is still positive, its just the difference in % of the 2 catagories.