Fortunately, DC itself agrees. The publisher released a statement addressing the matter specifically:
DC Comics is home to many of the greatest male and female Super Heroes in the world. All our fans are incredibly important to us, and we understand that the messages on certain t-shirts are offensive. We agree. Our company is committed to empowering boys and girls, men and women, through our characters and stories. Accordingly, we are taking a look at our licensing and product design process to ensure that all our consumer products reflect our core values and philosophy.