Gays cannot be refused employment in Colorado. We are among the 20 states there.

As for "state anti-discrimination laws to protect against discrimination on the basis of sexual orientation and gender identity and expression"... did Colorado join these states now? 

* "As of 2016, Michigan, Nebraska, Ohio, Florida, Arizona, Indiana, Pennsylvania, and Idaho are the only states with campaigns working in 2016 to amend existing state anti-discrimination laws to protect against discrimination on the basis of sexual orientation and gender identity and expression..."

Read more here: https://en.wikipedia.org/wiki/LGBT_employment_discrimination_in_the_United_States