bohemian I think what happened is awful and I'm not surprised you were upset.
I hope you don't mind me telling you that as a vegetarian I can't bring myself to wear anything that is 'animal' themed. So for me fake fur is not on, neither is any kind of animal print. The reason for this is I feel it encourages the use of animal skins in fashion. I realise I'm missing out on fashionable things, but I have bought a few things for my Mum she liked. The other year she bought a lovely animal print blouse and camisole as a surprise Christmas present for me, but it was a little tight on me at the time and now I just can't bring myself to wear it.
That said, I have never imposed my views on others and would not dream of speaking to a stranger. I think faux fur is very realistic looking these days, yet fashion designers have been using real fur again for about 10 years. If someone chooses to wear real fur for reasons of fashion, then that's their choice, but I have no respect for them. I doubt if they care, but I don't think it's right to give them the impression you think it's ok if you don't. Not when the animals die inhumanely.
I think that part of the problem with faux fur is just how realistic it can look and for someone reason there's a perception that older people choose real fur over faux. I think that's what happened to you. 