No one cares who makes your willy rise or who makes your chair slippery
Being offended by it is the dumbest shit in the world, it does no harm to you or anyone else. That being said, Neeko's lore page, that I have read, had no mention of it at all, she merely has a few quotes in game to represent her tastes. It is in no way represented in her gameplay. It's not a big deal. It's never going to be a big deal. Stop. Sexuality does not matter.