I don't think it's an all or nothing proposition. If you don't know someone very well then it's likely they are just looking for small talk. In that case whet

I don't think it's an all or nothing proposition. If you don't know someone very well then it's likely they are just looking for small talk. In that case whether or not they are interested in the topic, they aren't looking for something that is going to turn into a deep conversation at that moment. There are ways to probe for this though, just give a high-level summary like "just did some work on my side project" or similar where you give them an opening to ask a question and go deeper. This gives an easy out to end a conversation gracefully; if an actual grownup gives a snarky response like "you must be fun at parties", that person has way worse social skills then they think they do, and in all likelihood has some pretty severe security issues.