First impressions- I realize that I have my own set of biases, as will anyone else.
Our brains associate & form some impressions from our past, but the key thing is how long do we hold onto those impressions and do we recognize where they stem from?
It's funny when things like intuition get mistaken for prejudice/assumptions, when they're not. I think impressions that cause us to vehemently dislike someone are our own self-projections.. I don't understand that concept of hating someone without knowing them.
How do I deal with negative first impressions? I think- that person's having a bad day. If I'm being mocked at or treated in a disrespectful manner, then I back away- as I think 'respect' is something that we earn. If that's broken based on our first interactions, it leaves a strong impression on me. If I contributed to it, then it's usually because I fight back or I stand up for what I believe in- If I handled it in a polite manner, and I still get scoffed a nasty attitude back, then I really could give two shitsworth (in a really cold way). I find it bothersome in a way that sometimes I give people way more credit than deserved, then I'm kinda disappointed. It's also my own fault as well. I'm not perfect either. Far from it.
Other than that, I realize that people's moods may fluctuate. I don't hold them to that standard of whatever they present like it's solid fact.. Basically, I get in tune with their feelings. I don't really think much other than that.
Edit- I'm thinking of this purely on first impressions. Upon slowly getting to know deeper aspects of someone, that's a whole other story.