Why Robert Mugabe just shouted "We are not gays" in his UN speech

Robert Mugabe, the 91-year-old leader of Zimbabwe, deviated slightly from his prepared remarks during his Monday evening address to the United Nations General Assembly, to do something that he does frequently: slur against homosexuality.

Mugabe made the comment in the course of a point about double standards, which is usually dictator code for Im tired of Western countries calling out my human rights abuses, and about new rights, which is usually code for I long for the days when discrimination against certain groups was considered acceptable.
The Zimbabwean dictator has made overt homophobia official policy for years, and has frequently couched this in criticism of Western countries , sometimes saying that Western leaders wish to impose not just acceptance of LGBTQ rights but homosexuality itself on Zimbabweans or Africans generally.
Then we have this American president, Obama, born of an African father, who is saying we will not give you aid if you dont embrace homosexuality, Mugabe said in July 2013.
A global Pew study on attitudes toward homosexuality found that surveyed African countries tended to be among the least likely to agree that society should accept homosexuality.