As a former Chicagoan, I can tell you that our impression of Philadelphia came from their sports teams and their fans - the teams consisted mostly of thugs and dirty players and their fans made the behavior of Chicago team fans look like that of opera patrons. And their fans actually HATE their teams when they lose, and hate them somewhat less when they win.
Any time I’ve had the experience of sitting near the crews of Cubbie fans they routinely send to PNC park the experience has been very positive. Don’t know about Bear fans, but the baseball crowd travels well.