Man, can't believe I missed such a lively an generally well-rationed M&J debate.
Well, here's my 2 cents anyway.
I think it comes down to people being OK with stealing a girl from their current partner in adult games, and since Josy straight-up tells the MC she has a boyfriend, then most people, even the Maya haters, don't/didn't seem to have a problem getting with Josy.
With Maya, she said it then rescinded it, which meant that it came as a shock later. People didn't understand why Maya withheld that information and were and still are incredibly judgmental and view her as a terrible person who committed an unforgivable sin, even though it really wasn't that bad.