The worst parts of history don't need to be glorified. And it's not a bad thing that we recognize the meaning that history has for different people, especially when its disastrousconsequences have echoed through generations.
I don't think this is an instance of "the worst parts of history being glorified", which i agree is obviously a bad thing. Companies aren't designing sneakers with nooses on the back.
The problem is that history involves a long slow march of social/political progress, so at any point in the past things will have been worse in terms of rights for all sorts of groups, like women, LGBT, racial minorities etc. Women didn't get a vote until 1920, Jim Crow lasted until 1965, gay marriage is only recently legalized in all states by 2015, so the US can be called racist, misogynist, homophobic (and rightfully so) throughout its history, but that doesn't mean Americans or Canadians still can't celebrate history while recognizing that no country at any point, including today, is without flaws.