I get on with almost everyone in work - about 20 people in total - have been there more years than I care to mention. I have built up my role over the years and been promoted by asking lots of questions, doing qualifications and generally working hard. I have one colleague who has also been there for years. Her role has never changed over the years and has in fact decreased slightly in that she is losing confidence so doesn't get as much responsibility. This irks me somewhat in that I get these jobs to do. The main issue I have is the bitchy comments she makes to me. When I say something to her she says "really" in a sarcastic tone. She also says some of the things I do or say are "sad". She has also commented loudly several times over the years "imagine being married to that". For context she has never married or actually lived with anyone. I try not to let her bother me but it's getting to the stage where everything I say she makes a sarky comment. I love it when she is on holiday - I just feel so much better. She also assumes we are on the same wage ever though I have far more responsibility and I have negotiated pay rises and bonuses. Maybe she has found out about this?