A new group of immigrants or refugees are welcomed to Canada, only for a portion of the population to see those newcomers as 'not Canadian' and treat them as outsiders. Over time, many of those attitudes fade, and the newcomers become widely recognized as Canadian. Then, some of the descendants of those newcomers join in on treating subsequent waves of immigrants as 'not Canadian' and as 'outsiders.' On and on the cycle goes.
People of Ukrainian, German, Italian, and Caribbean descent (among many others) were once seen as outsiders to the Anglo-French idea of what it meant to be 'Canadian'. Now, people from those backgrounds are widely seen as Canadian. To varying degrees, people of African, Chinese, Indian (India), Filipino, and Middle Eastern descent have their 'Canadianness' questioned, and in some cases by those who were previously seen as outside the idea of what it meant to be 'Canadian'. The cycle continues.
Moving beyond that cycle requires building Canadian identity on higher ground.