I mean if it is kept within the realm of fantasy and not bridging the gap to attacking the player behind the character, I'd say it's all fair game.
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If you find people who want to write with a character of that nature, then you can. Most people I run into tend to find it uncomfortable, not all that fun, and pulls at allegorical experiences they may have had IRL before and don't really want to deal with in their own hobby that's often just for... well, fun.
In my experience, most people who choose to write characters as such tend to be pretty mediocre at actually writing a character and just want to make a scene/make other people feel uncomfortable for the sake of doing so and not for any compelling narrative. It almost always comes off as just someone's edgy high school fantasy. Especially since the actual themes at play, the morality of the theming, the compulsion for someone to be as they are, the actual nuance in the behavior and what fuels it along with the motivation are never actually explored (and, even then, isn't really a whole thing you'd tend to get into with randoms wherever due to the heavier material), which is again, just clearly someone who wants to write Shock Value the Character.
I haven't really gone deep at all in FF14 RP so my experience is very surface level, but it feels to me like RP in 14 is less segregated than it is in other games where I have had more RP experience. In FF14 it feels like there's a lot more bleed over from IC into OOC, and a lot more of that "casual RP" happens in more public spaces. Because of that it's hard to find an appropriate space for the more out there RP and characters. It's a lot easier for people to be personally offended by or bothered by extremes when the line between IC and OOC isn't as clear, even if extreme characters and perspectives could definitely fit within the FF14 RP landscape.
XIV roleplayers have significant difficulty in differentiating between IC and OOC on both sides at the best of times. Better to just not open that can of worms and stick to the meaningless Bar RP™.
The very same could be said about almost every RP players you know, ppl tend to be mediocre at writting and it has nothing to do with what they want to write, they just can't do it right and that's normal that's not an art for nothing.
Funny that you would tackle someone over it but only if they do stuff you clearly dont like.
And how many books did you sold yourself to have such a comment on others ?
I mean rping a caricature of these things isn't hard.
Figure out what particular thing your character is biased against, anytime something comes up relating to your bias your character just does stuff disadvantageous to said bias.
It's not that hard and it really doesn't take any mindset it's just discrimination.
Lets not pretend it isn't easy to be a bad person and make advantageous decisions for fictional rp characters.