Bart Johnson, High School Musical’s very own Coach Bolton, has spoken out about the negative attention Blake Lively has been getting. In case you didn’t know, Bart Johnson, known for his iconic role as Coach Bolton in the Disney Channel trilogy, High School Musical, is married to Robyn Lively. And she happens to be Blake Lively’s older sister. But as it turns out, the Gossip Girl star actually met her future brother-in-law before her older sister did. Having been in each other’s lives for over two decades, the movie star evidently wanted to stand up for his family. Blake Lively’s brother-in-la…