Dovetailing on my above post:
Dialogue options that are unclear what you are choosing. Like FO:4, and AC:O. You are given 2 options, but the actual wording on screen to choose from, are vague as hell, potentially sounding almost the same, but are also not representative of what you actually say.
Like your choices on screen are.
"The importance of history can't be overstated" or "I value the past." ......ok wut? How are those different? What am I choosing between?! Because they sound like the same basic concept. And then, when you actually choose one, what you say is completely out of sync with what you picked. This usually comes across in the form of tone. Like the phrase you picked seems reasonable and polite, but then your character suddenly becomes angry and aggressive.
AC:O had a really glaring example of this early on, that kind of freaked me out. You are talking to the NPC that is giving you the Baby's First Bow quest, to introduce that combat type. And she keeps shit talking Markos to you. And you get an option to say something like "I am my own person." or something like that. The phrasing seemed perfectly reasonable, as if I'm saying "Hey, don't compare me to Markos, I know he's kind of a lowlife conman, but I'm not him." But instead Alexios literally snarls, leans forward flexing his arms in a clearly hostile posture, and basically threatens this old lady to shut up and make the bow for him. So much so that she is shown to cower in fear of you, and apologize profusely.....and then Alexios ends it with the standard "Ok I'll take care of that for you! Take care!" in a bright and cheerful tone, ignoring how he just spoke to that lady.
And I'm just like "Ok where the hell did that come from!? How was all of that conveyed in the 4 word dialogue description I clicked on!?"