With that argument, Apple should've felt bad for Mac vs PC ads and Pepsi should've felt bad for their Pepsi Challenge campaign against Coke. It's what challenger brands do.
I see it slightly different - Mac vs PC or Pepsi Challenge calls out the competition and tries to show the consumer why the product is better. This seems to be marketing with an attempt to confuse the brand.
I don't think there is any brand confusion, it is clear the differences and even this post shows the difference