Somebody cuts in front of you driving and you assume it's because they have no respect for you, not because they're lost or some benign reason. The transferential feeling there is that maybe you were bullied as a kid so now you assume this driver is bullying you. That's transference IRL.

In therapy, maybe the t is nice to you, so you assume they're in love with you, because IRL if someone was nice to you, they wanted to get into your pants.

Either situation, you can talk to the other person and find out their true intent, but what is more important is figuring out why YOU react this way, so that a) you don't kill other people on the road and b) so you can be just friends with people without putting your own ideas on them before they even have a chance to say anything. Cuz that's the problem - transference is like a psychological prejudice where you misread another person's intentions. But you're sure you're right.