The phrase "button topic" refers to a subject or issue that tends to make people feel strong emotions or become easily upset when discussing it. Full definition
Since sugar is such a hot button topic in addition to healthy snack ideas, I'm also going to talk a bit about how to battle the sugar dragon. (eatliveandplay.com)
Or how global cooling was the hot button topic of the 70's? (reddit.com)
The lack of diversity in the legal profession has been a hot button topic for decades now and the industry has recently seen small gains. (hirelegalbee.com)