Why are single mothers considered trashy, while single dads are considered amazing?

The single mum went through pregnancy and labour and everything else, while the single dad only does the bare minimum - taking care of his child? Why is the parent whose done most of the work get called trashy, while the other parent who has done the absolute bare minimum, is praised?
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A lot of people are saying that they’ve never heard of this double standard, so I’m starting to think that maybe it’s just something that’s present in my country. I notice it a lot with parents that I know. I’m not a mother myself, so it’s not a question based on my own life and experiences.
Why are single mothers considered trashy, while single dads are considered amazing?
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