For the Haters
"El Plastico": The Red Bulls' heaviest Bundesliga defeat — as of December 2019 — came in the German "Clásico" against Bayern München: a 0-5 thrashing in the 2017/18 season. The nickname "El Plastico" was coined by fans mocking the rivalry between two investor-backed clubs.
The DFB-Pokal long seemed tailor-made for RBL's opponents: in 2015, a heavy defeat at third-division Unterhaching. In 2016, elimination at fourth-tier Sportfreunde Dorfmerkingen. Embarrassments that delighted every RB critic in the land.
SV Sandhausen: Of all clubs, the self-proclaimed "league dwarf" SV Sandhausen shot the "Bulls" to their highest home defeat — a 2-4 loss at the Red Bull Arena in the 2014/15 2. Bundesliga season.
Draw against Trondheim: It was the final matchday of the 2018/19 Europa League group stage. Although "sister club" RB Salzburg beat Rosenborg 2-0, Leipzig only managed a 1-1 draw against the Norwegians — and were eliminated. The Europa League adventure was over before it had truly begun.
Although RB Leipzig have only existed since 2009, the club have accumulated some notable negative records in the top two German divisions.

Worst league finish in club history: In 2017/18, 53 points in the Bundesliga were only enough for 6th place. The previous season's runners-up slipped dramatically.
Most defeats: In 2017/18, the "Red Bulls" suffered eleven Bundesliga losses — a club negative record.
Most goals conceded: No, the 2017/18 season was not RB Leipzig's finest! 53 goals conceded remain the worst defensive record in the club's Bundesliga history to date.
Worst goal difference: With a goal difference of plus four (57:53), Leipzig still scraped into the European places in 2017/18 — barely.