That is something we should strive to correct people on. I've missed online events with friends because they would tell me "X pm PST", so I obviously just put the time in any time conversion app and end up being an hour late. It's easy for Americans, because you do your conversation by hand, for you people it means e.g. "one hour behind my time", but for everyone else who has to use an app to convert times, it's quite annoying and error prone.
Though it might soon be moot given USA is moving to permanent DST, so rather than people using PST wrong some of the time, it will be all of the time.