What are some controversial topics in your world that its denizens often agrue about?

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Ill start. People often argue about where the "line" between species is. The world is actually made up of several dimensions that had their own designated "races". Then a prehistoric event called "the tear" happened in which the veil between worlds was ripped allowing people to easyily travel between realms. In my world there are 4 main kinds of "races" or sapient species:

\-Pre-Tear, the orginal species that originated before the tear

\-Post-Tear, species that evolved in new environments, from pre-tear species

\-Hybrid, species that are a mix of two or more other species

\-Afflicted, species born out of generational curses

For hybrids most societies follow the 91-10 rule. You have to have a least 91% of you're DNA be belonging to a certain species to be "one of them", and the 10 is, every 10% increase or decrease of you're ancestry of a certain species, you are considered a new species. A better way of putting it is a elf-dwarf hybrid that has 40% elf and 60% dwarf, is a different species than a elf-dwarf that has 50% of each.

There are problems with this, as by that logic a dwarf that is only 90% dwarf cannot identify as a dwarf. But, determining someones species is REALLY important, has they determine what cybernetic implants are compatible with you or what food you can safely eat.