I like Beyonce's music and think she's a great performer, however I disagree with her 100% about men using the women's bathroom if he "feels" he's a woman. It was a huge turnoff. I won't boycott her music but I just find myself less into her now.
I love the Smiths but I disagree with Morrissey about 80% of the time, still love his lyrics and voice though. I don't think you should mix political views with music. If it's good music, it's good music.