Fortunately, it's not your decision if someone is allowed to feel offended or threatened.
For example, if someone has questions about the quality of their work, a person might feel threatened — they might be afraid of getting fired — or they might be offended — they might be proud of their work. But we accept reviewing other people’s work as part of the work place, whether or not it offends or threatens.
Emotional response is not enough to establish that something (a) is illegal or (b) should be. With regards to feeling threatened, for example, we have to ask: Was the threat of something unlawful? Being fired for doing bad work is not unlawful; being fired for not putting out is.