Conflict isn't a problem in therapy, but that doesn't mean there isn't a problem with how a particular therapist handles conflict and the way in which that therapist's relational style is entering their client's sessions.  If a therapist isn't able to engage authentically, be curious about others' experiences, and remain willing to consider their own potential errors, it may be a red flag that the therapist is not personally a point where they can engage in interpersonal work in a therapeutic relationship. They may still have a lot to offer in other ways, but may not be able to help clients through the dynamic reshaping of their relational patterns.