I don’t get it

Three options:

  • It’s an anti-meme.
  • It’s a meme about how insignificant lactose intolerance is in the grand scheme of things.
  • OP hates people with lactose intolerance and wants to bomb them.
  • It’s a (dark) historical reference to the bombing of Hiroshima and Nagasaki, as most Japanese are lactose intolerant.