Key tip to using ‘females’ in a sentence. If it sounds like something from a creepy incel manifesto, don’t do it.
Example of what people are talking about: ‘I don’t think females should be allowed to xxx’
For racist variation: ‘I don’t think blacks should be allowed to xxx’
For homophobic variation: ‘I don’t think gays should be allowed to xxx’.
It’s defining a group by a trait rather than as people, as something other than and less than the speaker, who is then presumed to be a ‘normal’ person. ‘The exception that proves the rule.’
Yes, when studying animals we might use the scientific language of categorising them- ‘amongst this flock, the females display trait x, the males are smaller/bigger’. However, we’re at a cold distance when describing such groups, and not adding any immediate social, hierarchal subtext because of it.