Starbucks' most recent "scandal" is that it is currently featuring a cartoon lesbian couple in an ad and, potentially, on cups, leading to some backlash. However, this #BoycottStarbucks flap is nothing compared to past drama.
In February, some customers threatened to boycott the coffee giant after the company spoke out against the executive order barring immigrants from seven majority-Muslim countries from entering the US.
In late 2016, alt-right Twitter user Baked Alaska challenged his 123,000 followers to go to Starbucks and tell the employees that their names are Trump to "trigger SJW" employees.
And, while he was campaigning in late 2015, Donald Trump encouraged boycotting the chain for its lack of Christmas cheer.
Basically, if you're a pro-Trump conservative, Starbucks has been at the top of the boycott list for a long time. And, with its dedication to progressive social causes, it's likely to stay there for a while longer.