For some added context, this has been going on for years from all parties. Maybe this year was not the most amicable environment to do this in, and maybe these particular slogans were in bad taste, but I don't think this is as egregious as everyone is saying.
https://www.cbc.ca/news/politics/political-party-convention-gimmicks-1.2530848
It's not organized by left and right. It's organized by percentage of people who have an unfavorable view of Israel.
It would be weirder for 0% to be on the right and 100% to be on the left. Also, in theory, it's possible for those three dots to be in any order on the line.