i recently moved teams at work and am now sitting next to said colleague. One problem i have with her is that she is the union organiser (or whatever the word is) and therefore knows i am not in the union (and do not intend to be, for various reasons including that i happen not to agree with some of their policies). She is now berating me at every turn for being selfish, taking opportunities for myself (i.e. pay rises) without giving back anything etc. It probably sounds minor but coupled with the other things she does (including constantly stating that others are picking up the slack as i am part-time) its really upsetting me and feeling like i hate work when actually i love it.
Any advice about avoiding tension etc would be very welcomed!