You don't really give a lot of info — like examples — so it's tough to go on, but I would say it's likely a pretty big red flag. You shouldn't be "walking on eggshells" ever in a relationship, let alone with your therapist. Therapy should be a safe place where you can talk about anything without fear. If you have to censor yourself as you say because your therapist might get angry or upset with you, that's not a good environment. Yes, therapists are real people with real feelings, but a lot of it should never even enter into therapy. It sounds like a lot of countertransference on your therapist's end for whatever reason. Unfortunately nothing you can really do about that. They have to deal with their own baggage, not you.