If you edit a page about any Middle-East conflict, or gender - well you can expect at least one, if not both sides to hate you. Even if you were a perfectly rational and objective ideal editor.
~ Cooking: food nationalists are constantly claiming that Biryani belongs to their nation and nobody else's.
~ History: nationalists again, especially over Turkey, Cyprus, or anywhere in the Balkans.
~ Politicians: most articles about politicians are so bland as to be almost worthless, because anything interesting is quickly excised citing 'BLP' rules.
If I edited under my own name, I'd probably have to stick to articles about obscure botanical species, and places that nobody goes to.
1 - this pseudonym has followed me through many places and it was time for a change