There are clearly mob reactions to things, but there are also clearly inappropriate speech that should have consequences.
What he said here wasn’t in isolation as some idle musing. context matters. He wasn’t talking about the theoretical of a 19 year old. He was talking about this in context of Minsky being a 74 year old man with a 17 year old girl. Maybe he wasn’t aware of the impact of his words, but that shouldn’t get him a free pass.