There are 3 parents in my office - all 3 of us have opted for our children to have previously had the MMR vaccine and 2 of us have children who are due for their booster (me and another).
During a break this week the topic came up and the discussion was if any of the kids had a reaction (temperature, sickness, tiredness) first time round.
Our manager over heard and launched into the MMR/Autism argument. We (three parents) listened to what she had to say stated our own opinions and left it at that. The following day our manager brought it up again and again went down the route of MMR/Autism. My colleague was visibly upset as one of her children is autistic, she doesn't believe it had anything to do with the vaccine and after careful consideration opted for her second child to receive the vaccine. Her second has shown no signs of being on the spectrum and now that her third is due she has opted to have him vaccinated also. The manager was like a dog with a bone and heavily implied that in opting in for the vaccine she aligns the decision with child abuse 
. Now whilst myself and one colleague were able to just roll our eyes understandably the other who's first child does have autism was really upset although didn't actually tell our manager this.
Since this the manager has apparently (I have been out of the office so not party to the conversations) brought it up several more times and posted several links on FB against the MMR vaccine and I'm seriously considering having a word if she brings it up in my presence again since my colleague feels unable to do so.
WIBU or unwise for me to do so or since she feels it is her given right to judge and criticise our decisions and quite frankly is like a dog with a bloody bone would it be perfectly reasonable to call her out in front of others if she brings it up in front of others again?