I would say that from my experience (as a woman, who has spoken with other women as the only women on male dominated teams) we don't assume that interruptions are caused by malice. Some interruptions are what I would class "normal" where anyone could be interrupted by a situation/person and some interruptions are what I would class "not actively malicious, but really rude" where people assume that the speaker is not saying what the interrupter would want the speaker to say. Multiple interruptions in a discussion by an individual can show a lack of observance of normal conversational patterns, or a lack of care. It's a fun mix of many reasons, some of which are inadvertently malicious.