hey , well by reading this if i was a parent and that was a kid i knew -
I would be concerned as well .
I would talk to his parents and inform his parent(s) about this behavior .
I can't really label it either other than it is inappropriate and
totally bad choice in "humor "
Maybe his parent(s) have a better idea as to why he would do such a thing .
a kid being that over dramatic with their response to something like a break up
is eye opening and certainly not right .
I would keep an eye on it and
Id i were the mom I wouldn't want my daughter to hang around someone who chooses to joke about things such as that.
how ever i understand that people cant force their kids to hang with certain people
good luck