After a “douchebag” in a bowler hat was photographed taking up two seats on a crowded bus — and allegedly assaulted a woman who tried to stop him — thousands of Torontonians have joined an online hunt to track him down.

In a matter of hours, the search for the “leprechaun,” as he has been dubbed because of his green dress shirt and tuft of chin beard, had become one of the most high-profile examples of using social media to shame violators of TTC etiquette.

Brenda Davie/Facebook

“So after work I get onto a packed 72 Pape bus and I ask this COLOSSAL DOUCHE BAG very nicely if he can please … move his bag off the seat beside him so I can sit down,” wrote Facebook user Brenda Davie in a Wednesday night post.

“He says, ‘No, my bag is there.’”

In the brief exchange that followed, according to…

For Edmontonian Jodi Costello, a night on the town is a flurry of mandatory monetary thank-yous: First, the cab driver gets a tip. Then the bartender during the wait for a table. Then the waitstaff when the cheque arrives.

On vacation, she tips the hotel housekeeping staff $3 to $5 a night — but only if the room is impeccable.

“When it’s just the basics, that’s the hotel’s job, I’m paying the hotel to stay there as it is. I don’t feel that I have to go above and beyond to make up somebody else’s wage when I’m there.”

It is what observers are calling tipping fatigue — when the act of giving a gratuity becomes more of a social expectation than incentive for performing better service.

Global hotelier Marriott Hotels and American journalist/activist Maria Shriver were criticized this week for their new The Envelope Please campaign. It encourages guests to…