I hear this fear a lot, and have never seen any evidence of it whatsoever. Not saying it doesn't exist - just that I haven't experienced it. The only people who've ever mentioned to me that my word-choices were harmful did so with an intention to educate and reduce-harm-to-themselves-or-others, not to undermine or silence me.
Never experienced that yourself? Babies do so very commonly when they cry. My understanding is that adults get out of it to a degree.
I guess the vast majority of people do so with honest intend and some don't. If it is about definitions and wording on hot button issues, I think the latter group to be disproportionally large.
And I disagree; and based on that fundamental disagreement, we're never going to reach agreement on the derived conclusion. Oh well.
> knowing that those words may hurt someone
Some people aren't really hurt but like to erase your message by depicting your expression as hurtful. Maybe they just don't like you, it would be another reason. Your naive line of thinking draws in people that might want to take advantage of you. I don't think it could be a universal rule for the internet.