They're both fanatics in their own ways, one doesn't get out much, and the other one is just an ungrateful *sshole (just ask his 'friends')...so they won't care.
Its just that one would think they would be grateful to have the support of the Dragonborn on their side, and know better then to threaten him/her.
Look, my post-main-campaign dragonborn male nord was escorting Serana to her ancestral home, because she had been respectful, nice and all that despite being a vampire, so I figured, why not, if a vampire is not aggressive, or evil, live and let live (if some idiot highwaymen attacks her, which they always do, she can drink them, no problem, its the ones who attack people that are the main problem). But her daddy obviously had no clue who I was and threatened me when I respectfully declined his pompous and il-suited offer. When he said I was pray, I was like thinking, with that chant echoing in my mind: What are you rambling about you delusional old fool. Having been cooked up in this castle for too long have we? Next time we meet you either have a change of heart or I will turn you into a pool of gore. And that is also what happened in the finale, I tore through the vampire lines like a tornado leaving sacks of sliced, diced, crushed, twisted and burnt undead meat in my wake. He never stood a chance.