Comicbook writers have to dumb down superman because otherwise he could win 99,9% of all fights 
no
spiderman just brings some kryptonite and R.I.P superman
Superman might bring a machine gun and just turn spidey into swiss chese, or burn him with a flamethrower
the spidey could do the same
kryptonite isn't a tool, it's a god damn rock
besides he has spidey sense, superman however does not, he's more agile and could easily avoid being hit by superman
If superman just grabs spidey - he's dead. Superman is far stronger, and could just break his neck with 1 hand or burn him with his eyes, or just fly to space to suffocate him. What can spidey do?