Wrong! There are numerous examples of humans mightily fearing angels and angels doing great harm.
Numbers 22:31 Then the Lord opened the eyes of Balaam, and he saw the angel of the Lord standing in the way with his drawn sword in his hand; and he bowed all the way to the ground. 32 The angel of the Lord said to him, “Why have you struck your donkey these three times? Behold, I have come out as an adversary, because your way was contrary to me. 33 But the donkey saw me and turned aside from me these three times. If she had not turned aside from me, I would surely have killed you just now, and let her live.”
Could be an empty threat.