I mean, in general, if I see the term "mansplain" on the internet with no context, I'm going to assume the usage is in line with what's described on urban dicti

I mean, in general, if I see the term "mansplain" on the internet with no context, I'm going to assume the usage is in line with what's described on urban dictionary. Just because that's how it's actually predominantly used. This is the first usage I've ever seen that was something else. So it's not totally unreasonable.