This is a request for information. We all know about the force of a first impression on other people, but here's something I'm extremely confused about: how easy is it to spoil somebody's impression of you when you have already known them for a bit? I'm asking this from a male perspective, but with respect to both inter- and intra-gender interactions. I'd appreciate both scientific studies (I'm not aware of any) and personal experience, because I really have no clue. My past interactions with people have been extremely high-variance in this respect, I don't want to generalize from the example of myself, and figuring out the answer in any given individual case to gather more data is not trivial due to the noisiness of signals in social communication and the costs of asking explicitly.