I think it all boils down to how well you can handle people be it a MIL or a buddy. Relationship issues come from unrealistic expectations and unnecessary sensitivities.
My MIL is quite different from me and even though we disagree on many things, i have learned to let go of a lot of things just because a month down the road they won’t matter anyway. I’m sure she has to do the same because to her I’m defintely not as perfect as I think I am.
So education or no education, I think a lot has to do with the personal choice of controlling our attitude.