There's a lot of people in the comments saying that Vietnam didn't really "win" the war. Their political and military objectives were ultimately successful, those of the US/South Vietnam were not. That's what a victory is. The cost of victory was very high, but it was a pretty unambiguous success for the Vietnamese.
Exactly the same way our close neighbours Pakistan keeps thinking they didn’t really lose any wars against us.
Even the people who were not even a foetus during those wars. Emotion trumps facts it seems.
Being in denial for so long.