Everyone is obligated to share their truthful impression of everyone they encounter upon every contact. Just get past all the stigma. We'd all know most of us are totally indifferent to one another. However I would love for it to be normal to tell people I'm attracted to without stigma and in the casual context that I feel without there being some deeper meaning, awkwardness, or tension.
First one I disagree with. Most people think things that they don't necessarily agree with, especially as first impressions. I might have to tell someone I think they look shady, and It turns out I just have some sort of unconscious bias.
I am fine with that. I want to know. Such information says far more about yourself than it does about me. I will find out this information in short order by inference. Why not save me the time, and anyone else for that matter. It is okay to disagree pleasantly, online or in person.