Celebrating the end of WW2 is racist because it happened against Japanese?
Since the day marks the surrender of the Japanese, it's somewhat racist.
This is nonsensical. We weren't fighting the Japanese because they were Japanese; we were fighting the Japanese because they bombed us. There were certainly some racist actions taken by the US during the war, but that hardly makes celebrating Victory Day racist.
It's also pro-nuclear weapons.
That's like arguing that the Fourth of July is "pro tar-and-feathering" or that Bastille Day is "pro-guillotine". I'd add that, unlike both of those examples, the use of the atom bomb probably reduced the death toll in the long run, as the only alternative - a land invasion of Japan - would have been a bloodbath. Secretary of War Henry Stimson estimated that as many as four million Americans would be killed in such an operation (to say nothing of the Japanese casualties), compared to less than 300,000 killed at both Hiroshima and Nagasaki. Obviously, it would have been preferable for 0 people to die, but that's not how things work in war.