To use male trees in parks (when possible) is a technical choice, totally unrelated with sexism. To link all things with female opression is unhealthy and a mess leading to absurd dead ends.
Cities are full of "male symbols" in form of phallic shaped towers and square high buildings. Should we remove all of them and start building round hemispheric houses instead? Should we remove only the 50% of skyscrapers?
The term botanical sexism is unfair for garden designers (not always men) and creates a non-existent problem