With these individuals, I'd avoid being blatantly honest and objective. Even if you helped them, they tend to take it personally and undermine your relationship

With these individuals, I'd avoid being blatantly honest and objective. Even if you helped them, they tend to take it personally and undermine your relationships. So, whenever they're wrong, I show them I have a completely different background/side("the guy who knows math") and make them conclude something without directly saying it( using indirect questions maybe). With that, they "were not wrong" (their nightmare) and you just helped them come to the right conclusion("like always").