The thing about probing a rotten tooth is that you do it inside your own head and you don’t need to tell everyone about it. I’m sorry but I think it probably does make you less nice than you think you are - not having the thought, everyone has unkind/ugly thoughts but I think it betrays a lack of empathy and understanding, you seem more concerned with how you seem than how you act. How can you be ‘pro support for mental health in theory’? That doesn’t make you a good human being, it just makes you not a bad one.
FWIW the video is a bit irritating. But if you can’t see past the medium to what the person is trying to articulate, then I don’t think you are kind or empathetic. Think about the person with anxiety who made the video. If they read your thoughts on it, it’s likely that it would reinforce feelings they already have of not being entitled to ask for what they need, of being irritating, being a burden, putting themselves out there and being rejected, looking foolish or needy or weak...these are all things that people with MH issues struggle with with every day.