There have been instances of people being fired because someone "complained" to parish or school leaders about a person being gay (and single).  

On the other foot, I know lots of situations where gays teach or are music ministers and no one has an issue with it, until they get married to their partners of 20 or 30 years.  I had a partner for 13 years and am a church musician and never had an issue.  There are gay priests and bishops who don't get fired (some have), so it's all all over the place.     It depends on the diocese and the parish.    

You can look back on this publication and see articles about people being fired for being gay.  https://www.ncronline.org/blogs/distinctly-catholic/hiring-firing-lgbt-catholics is one.