People who cite other things like fireworks likely don't care about the environment, they're just using those things in an attempt to dismiss any arguments against something they don't want to give up, like straws.
Saying that fireworks are bad for the environment therefore we should have plastic straws, plastic bags, and never recycle, etc. is silly.
There's always going to be waste and negative environmental impacts. We should try and reduce those things where we can but address each on an individual case.
Fireworks have benefit in that they are entertaining. Plastic straws provide minor benefit, but I can easily make do without them. I just don't feel I need them in my life the way I might still want fireworks in my theme parks.