Is it normal that i absolutely hate coughing

i worked with a girl for 2 years and she had the most horrendous smokers cough. she would cough so bad she would make herself gag and almost throw up. i would have to listen to this 8 hours a freakin day, 5 days a week for 2 years!! now when i hear someone coughing, it reminds me of her.
i have nothing against smokers, i am one myself but i only have a few a day, she went out for a smoke every half an hour and she even had asthma. just everything about her was horrendous, her look, her smell, her clothing, she had so many freckles, i used to call her a big freckle! she would also flirt with my husband when he came into work to see me at lunch time which made him quite uncomfortable even though she was married herself. i felt so sorry for her husband.
she hated me because i am 10 years younger than her and i was her supervisor and she used to complain all the time to the big boss when i told her off. i figure if she did her job properly i wouldnt have to keep telling her what to do. he just told me not to worry about it. i never understood why the boss kept her here but she eventually quit which was the best day of my life!! is it normal that i get so frustrated at a little thing like a cough now because of her?