i'm not very traditionally minded and not a fan of saying "people SHOULD do this and that". we all have stuff we're ok with and stuff we're not.
but i do think if i'm getting vibes the other isn't that thoughtful or "caring if they annoy me or hurt my feelings" then its a bad sign
if only because i like to feel like it matters to my lover what i think and feel when i'm with them.
i'll let some stuff go, especially in the early stages of dating, but it means i feel less connected to them, and more likely to finish things sooner - it's like my "goodwill store" runs out? 
although of course hopefully both of us have to be a bit "reasonable".
(if anyone remembers "transportgate" with the european, the lack of thoughtfulness really pissed me off more than anything)