Whether it was anti-semitic or not is just one of many issues with what they did. When a big company trademarks your name, that’s a serious personal attack; its really intimidating - try to imagine if a big company came after you personally like that.
If a person, or company, does something sufficiently evil I don’t need to see a pattern in order respond. In Behringer’s case, they already crossed that line for me. That said, I think you can indeed find some patterns of poor behavior on their part in addition to that one episode.