Charles Darwin gets into an argument

Darwin was at a pub when he engages with a man
in an argument.
The argument becomes more and more virulent until the man remarks, "At least my children won't grow up to be retarded!" to which Darwin replies, "At least I'll be able to have children". The man is confused and inquires as to why Darwin said that.
"It's simple really, if two different species mate, they cannot create fertile offspring. Using this knowledge and that your mum is a bitch and your dad is a pussy, I can conclude that you can't have kids".
Edit: Wording

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