The cups and bottles crashing at his feet in the Dodgers bullpen last October crossed a line.

Nobody would argue that.

But, truth be told, Jeremiah Estrada spent his youth pushing right up against that line. He and his friends heckled the likes of Max Scherzer while hanging over the bullpen railings at Chavez Ravine, trying create the sort of hostile environments that might — might — create a home-field advantage.

So game recognizes game, even in the rowdiest of places. Like at Philadelphia’s Citizens Bank Park.

“Philly’s freaking crazy,” Estrada said. “One time, it was like, ‘Hey, your little brothers are (expletive) ugly. I’ll slap the (expletive) out of them.’ I turn around and the kid is like 12 years old. I was like, ‘Where are your parents?’”

Estrada is laughing as he raises his right hand: “And the dad’s like, ‘I’m right here.’ I was like, ‘What the (expletive)?’ But I’m not going to lie. That’s going to be me as a dad. I’m going to be cracking up — ‘Talk your (expletive).’”

That’s baseball, as the Padres pitchers say. And if you’re going to stick in the big leagues, you have to block it all out.

“I don’t focus on any of that,” Padres closer Robert Suarez said through interpreter Jorge Merlos.

Dylan Cease doesn’t, either, but every now and then something breaks through.

Especially when it’s coming from an unexpected source, as was the case while warming up for his start at Yankee Stadium in May.

“Some kids were giving me a hard time the entire time,” Cease said. “You could tell they were, like, high school kids. They were trying (get under my skin), but nothing crazy.”

Count reliever Jason Adam among those who relish the back-and-forth. To a point, anyway.

“I honestly like when the fans are on top of us,” Adam said. “I just think it’s fun. … Obviously there’s people that cross the line.”

When it gets to that point, Wandy Peralta’s M.O. is to turn a deaf ear to it.

“There’s things that they say that probably shouldn’t be said to a player and they probably wouldn’t say it in front of our faces,” Peralta said through Merlos. “It’s things that shouldn’t be ever said to any person or any player, but you just kind of just put your blinders on.”

Because the line was crossed so aggressively last October, reliever Adrián Morejón rates Dodger Stadium as a more hostile bullpen than Citizens Bank Park.

“What happened with the fans, it got out of control a little bit,” Morejón said through Merlos.

Estrada agreed, recognizing he and his friends were no angels when they set their sights on an opposing pitcher back in the day.

“Being a bad kid … I’ll throw a piece of gum at him or sit there and be like, “Ball!,” Estrada said. “Or, ‘I’m taking that (expletive) deeeeeeeeeeeeeeeeep.’ But ‘m not throwing a beer bottle at somebody in the main game because the left fielder (upset me), …  because they’re doing showboating (expletive). That’s soft stuff. You let another man make you mad. Like, come on, it’s a baseball game.

“But (heckling) is more of the game. Fans are just trying to get at the players. You’re trying to get in their head.”

The changes in place this year at the Citizens Bank Park shields relievers from some of the rowdiness that occurs in Ashburn Alley. Both bullpen benches are now enclosed in climate-controlled environments behind sliding glass doors, but there’s still nowhere to hide when it’s time to warm up.

Barstools are aimed at the back of pitchers throwing — and not at the game. It might as well be an invitation for Philly fans to be Philly fans.

“Really just the fanbase is brutal,” Padres starter Joe Musgrove said. “Sometimes it’s good banter, and then a lot of times, just bunch of (expletive). Philly’s a tough place.”

Added bullpen coach Ben Fritz: “There’s just something about getting flipped off by a 6-year-old.”