Geez, people are dumb.
Um, no. Single mom's are already celebrated on Mother's Day…and in most custody cases, on TV, in pop culture, and via their own pity parties they have with other single moms. Yaaaassss Queen!
Pretty straightforward. Father's Day is for fathers.
If they didn't want to feel left out on Father's Day they should have made some different life choices.
ETA: celebrating Jews on Christmas makes more sense than celebrating moms on Father's Day.