Is the left's love of anti-nationalism their greatest weakness?

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Is the left's love of anti-nationalism their greatest weakness?

"Boarders are a made up line on a map. England and France are the same thing anyway. Open borders. National traditions are chains around the necks of the working class. Refugees welcome." This has been the standard left wing ideology for some time now but I believe it is holding them back. People have been tricked into thinking their countries are real and they should care about who their ancestors were and what their ancestors did, this we all know is wrong and people should care about the globalised (Globalized) diverse world in the present and future not the past.

As it is now the left is stuck. I believe the left should pander to the nationalist feels of the working class to get their votes in the short term but still create policies to push us into the future. Easier immigration, a more global view taught in schools and more focus on the black slave trad done by white people. More hate speech laws so that fascists are even afraid to think wrongly.

How do they pander to the working classes you ask? Simple, film Corbyn wearing a sports shirt sitting in a pub, have Labour petition to turn the NHS logo letters into red, white and blue because of Britain and finally release propaganda videos of Battle of Britain footage with inspiring music and then at the end have a black screen that says "Labour is battling for Britain" and Britain should be in red, white and blue.
The only way the left can stay true and still win. thoughts?