I don't think it's bizarre. I've honestly wondered this for years anytime discussions like these would pop up. I remember you saying you would never buy a German car, and I couldn't help but think "why?!". That seems idealistic to the point of absurdity.
I'll always understand the unfortunate dislike for the swastika, but at this point that sentiment is pretty universal among the western world. But things like, avoiding buying a German car or other harmless products.
Did you adopt opinions on things (political and/or ideological) just because you converted and it was the trend within your husband's family? It just seems strange considering you don't have a strong faith (if any), in God.