It’s God who is The Word and His word created the world >John 1:1<. See the theread “THE WORD”. It’s words that changed the world. It’s words from the Gospel who must hurt the sinner and words who lead onto the way Jesus Christ is. (I am the way the truth and the life). Such words indeed are meant to hurt and change to the better.
Words though, can become sin and even mortal sin; if they are spoken in the intent to hurt and kill - which words very well are able to! They can eat the soul. (Though not kill the soul, which is immortal).
However; peoples words must have deep impact on us - if spoken in Christ’s way. If they had not, then all Christian teaching would be in vain. Precondition is, that we any time are ready to listen and to change and stop doing wrong habits.
Wrong criticism must never bother us, though we must instead of just ignore, explain why we won’t do as required, even if it means to love our enemy

If somebody’s word intends to offend, we are called to forgive not just seven times, but seventy-seven times! (Mt 18,22). If though ours is offensive, then we just sinned, ’cos we one again disregarded Christ’s doctrine!
In all our talk, even smalltalk, we are called to be any time aware of Christ’s doctrine, which consists of but one commandment= Love (Mark 12,31)
So, yes, to a great extent we are responsible for the people’s feelings who are around us. For if we meet and “handle” them in Christ’s demand and paragon, they will feel relaxed and loved. Bad people only can resist honest and open love! A love we are even called to meet with our enemies. A terrilby important command of Christ!
Yours
Bruno