The Jews in Thessalonica are jealous because this King these travelers are talking about challenges everything about them. He shows them for what they are, and undermines the whole establishment of worldly religion. So once again a riot takes place. They rush to find Paul and Silas, and failing to do so, they drag Jason and others before the authorities, who work them over a bit. And then in Berea the same thing happens again.
Worldly religion finds itself challenged by real faith.
Everywhere Jesus' servants go they upset things, disagree, cause trouble, stir things up, and make it hard for the members of the culture to keep the facade in place. The third city is Athens, and as I've said, another riot breaks out, except that it's an intellectual's riot. This riot does not get mobs from the marketplace, throw people in jail, beat them up and run them out of town. It is agreed that university degrees and promotions, offering opinions with grave-sounding words and large vocabularies make you important. Guilt is covered by use of one's intellect.