Essentially, someone submitted a PR on GitHub changing a "he" in the build instructions to a gender-neutral "they", to which the main dev of Ladybird (Andreas Kling) replied:
This project is not an appropriate arena to advertise your personal politics.
This next part's just my opinion; that's an insane response to someone suggesting neutral language. As a non-binary person, I wouldn't feel comfortable around this person after such a reply, and I certainly wouldn't donate to Ladybird or anything of the sort.
That being said, we all likely use tons of software developed by people way worse than Kling. As long as it's FOSS and is privacy-respecting, I'll run code that's been written by bigots. However I definitely won't support them by recommending their software to others, or by donating time or money to the project.
I worked with a 17 year old once who knew the entire lyrics to Alice's Restaurant and would recite them, not sing them, in the most deadpan voice.
I miss that guy.