Wilson, 35, who was presenting the best supporting actor award, said she had been "practising her transgender face" in the hope of winning a prize and then referred to Elba as "chocolate" at the last night's ceremony.
"I've never been to the Oscars, because as you know, they are racist," she said at London's Royal Opera House.
"But Bafta have diverse members and that's what we all want to see in life, isn't it? Diverse members. One day I hope to return here to win a BAFTA myself. I have already been practicing my transgender face."
Wilson is known for her roles in "Pitch Perfect" and "Bridesmaids".
Elba was nominated for his role in "Beasts of No Nation".
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