Its not sarcasm. Plus, Muslims can use fireworks
"
It is permissible to use, sell and buy fireworks on the condition that this does not cause frightening or harming a Muslim, and would not lead one to neglect his religious obligations. In addition to this, their price should not be very expensive, as in this case they would be forbidden. Fireworks are permissible in principle but it they lead to something forbidden, which is the loss of money and spending money inappropriately, then this is wasting money which is forbidden."