Why would you celebrate it? What victory does he bring home? What foreign lands has he conquered and captive foreigners chained to his chariot wheels? You blockheads, you unfeeling men! You hard hearts, you cruel men of Rome, didn’t you know Pompey? Many times you climbed up on walls and battlements, towers and windows—even chimney tops—with your babies in your arms, and sat there patiently all day waiting to see great Pompey ride through the streets of Rome. And when you caught a glimpse of his chariot, didn’t you shout so loud that the river Tiber shook as it echoed? And now you put on your best clothes? And now you take a holiday?
Here's the translation of it, you should be able to understand that more.
But what I get from it is that there are the people of Rome, maybe, and they are praising and following someone whom doesn't deserve it and instead the should praise Pompey because he is worthy of it.
