Why do white men have issues with single moms that have half black children?

I see it all the time on social media; particularly on X. White men basically love to make fun of single mothers with half black kids. Many of them seem to specifically target this demographic as being undatable and trash. Why is that? If you are skeptical about this just go on X and you will see it yourself. You don't even need to search for it as Elon makes sure that racist accounts that fear monger hatred for black people regularly floods your feed.

Example of many racist post seen on social media targeted at specific group of single mothers
Example of many racist post seen on social media targeted at specific group of single mothers
Why do white men have issues with single moms that have half black children?
Why do white men have issues with single moms that have half black children?
Why do white men have issues with single moms that have half black children?
Why do white men have issues with single moms that have half black children?

You never see white men make any other scenario for single moms other than a white woman who was abandon by a black male. Some even insult the child's appearance and call them an abomination.

Updates
10 mo
I have no issue with men in general being against dating single moms. I am just wondering why this particular scenario gets singled out all the time and condemned. White, Hispanic and Asian men can also abandon their kids, and single moms can also be formed from failed marriages.
Why do white men have issues with single moms that have half black children?
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