Spiderman pulls his punches when fighting opponents significantly weaker than himself. That means anyone who can't Bench at least 15
tons. He's always worried that he will kill or serously injure a weaker opponent.
One of the few times we see Spider Man with That Look in his eyes was after Kingpin ordered a hit on Aunt May. She was shot and left in a coma. Spidey had a complete sense of humour failure, broke into the prison where Fisk was being held and beat him so badly that Fisk couldn't even stand. He then pulled the Kingpin back to his feet by his man boobs
. And warned him that when May died he would return to finish the job.
Batman is Metahuman; there is no way a guy walking around at 210 is benching nearly five times that raw. But in every physical way, Batman is still vastly inferior to Spiderman. It's just not even close.
Give Bats some Prep Time and yeah, he could probably figure out a way to nulify Spiderman's advantages. In a straight fight, with no training camp? Batman gets besmirched.