Bruce can now feel what Jason felt. This is very dark and intriguing. For Jason wanted Bruce to see what emotions and pain he was going through. The crowbar that was once in the hands of a joker, is now in the hands of Bruce's "failure".
The others don’t bring up Steve’s past often because they’re worried it’s a sore subject. But teen Spidey doesn’t have that filter, and is just excited to meet a guy from the Steve enjoys it - it’s not often he gets reminded of the happy parts.