Is it legal to discriminate a candidate based on her/his sexual orientation

•After watching this video, please answer the following questions.

1.Do you see any ethical issue in this video? Why?
2.Is it legal to discriminate a candidate based on her/his sexual orientation? According to which law/act?
3.What might happen if you hire this candidate in your company?
4.What you might need to do once you hire this person?