> Reacting to these situations with denigration and hostility is very unlikely to leave a good impression
Why would I care if I left a good impression on a person using astrology to judge me? I wouldn't expect nor want things to go any further.
If you enjoy being cruel to casual acquaintances who haven't hurt you in any way I don't really know what else to tell you.
Meanwhile, it turns out astrology is pretty good at revealing people who mock and denigrate others for no good reason. Who'd have thought it? Maybe I'll start using that technique.
Flirting is an informal process for obtaining answers to questions about a potential partner in advance of any significant commitment or risk and without having to deal with matters of any particular importance; questions such as "how well do we communicate?", "do I enjoy spending time with this person?", "how do they perceive me?", "how do they describe me to others?" and "how do they respond when we disagree on something?"
Reacting to these situations with denigration and hostility is very unlikely to leave a good impression; though certainly it does yield valuable information to the recipient.