While the color coding could have been unfortunate coincidences, David Yost, the actor for the first blue ranger was bullied off the production for being gay.

https://en.wikipedia.org/wiki/David_Yost#Career

According to Yost, he was often called a “removed”, and the producers frequently questioned other cast members in private about his sexuality. Yost left late in the fourth season after a week of contemplation and thoughts of suicide instead of continuing work another six months into the second film. He stated that the co-workers involved with writing, filming, and producing the show considered him “not worthy” to be where he was and that he “could not be a superhero” because of his homosexuality.