There are persons out there who are in pain and instead of expressing their frustration in a healthy way, what they will try to do is kill your joy and as we say, rain on your parade.
Be compassionate, bless them, send them love and peace and move swiftly along on your path. Misery likes company. Perhaps one day they will realize that life is what you make it- you either embrace it with joy and an open heart or you wallow in your misery. In the meantime you just need to run into your blessing!