Dear Priyanka,
if you are in HR profession, you can only avoid general discussion with them. as a part of your job, you even should not avoid people you don't like. as it leads to partiality or biasness in our profession.
i know its not easy to implement this always us professional approach. if you want to communicate some msg to them, mail them or call them, talk with them politely, you are doing your job, nothing else. don't involve in further discussion with them, be specific to the point.
but never ever forget that this dislike should not develop biasness in you, it may be harmful for your profile/job and for organisation as well. then you might have to face blame for biasness by management or your employees.
I have seen HR people facing such problems where mgmt blames them for biasness or partiality even when they are just doing their jobs i.e. involves lot of interactions with employees.
I believe HR guys should be always open to listen their employees no matter you like them or dislike. listen their opinion, analyse yourself, to what extent you are right or wrong according to them.
regards,
Nishu