Whichever candidate one supports is their own business, and nobody should be attacked for it.
If Mike had posed with a pic of KKK Imperial Wizard David Duke when Duke ran for president (and took the additional step of proudly posting the pic on social media, had it existed back then), would this be an exception to the rule? You'd take issue with a person of color attacking Mike for posing with Duke? What if that person was Blondie?
Not trying to veer into sandbox territory, but just pointing out that some candidates are THAT divisive, and there's a reason why there's so much opposition to the very idea of the band playing for Trump. There's a reason why it's BAD for the brand. I'm not equating Duke and Trump, but I still would like to know your answer to the question.