It's possible they're both right; I do not think Sanders is stupid enough to make this comment, nonetheless to Warren, and I do not think Warren would benefit from just making $#@! up about Sanders (since he's had so much support in the past and currently from women and Millennials). A misunderstanding, though? People say and misunderstand each other all of the time. Seems like a lot of conflict is based on that.
Interesting, though. I am just inclined to think they're both smarter than this even if I do not agree with their political views.