...Thinking about it, Jotaroi's family has plenty of experience seeing past this, so Mizore would also be easily seen through?Jotaro also actually genuinely loves his mama. (see: that massively panicky-pissed-off reaction he had when she tried to get out of bed despite suffering from Stand Fever)
He's just oblivious to the fact that he normally comes across as a total dick to people who don't know him really well.
I want to see Joseph and Mizore meet even more now.