Racism
Sexism
Referring to transgender person by their previous name or gender
Voting Republican
Indicating approval of Trump
Attending conservative evangelical church services
Not selling a cake to a gay couple
Climate change denial
Opposing Medicare for All
Supporting Kavanaugh and Thomas staying on the Supreme Court
Denying that Russia interfered in the 2016 election
Supporting a border wall with Mexico
Supporting sports teams that I don't like
Enjoying mayonnaise
Grammatical or spelling errors
Driving slow in the left lane
Opposing statehood for Puerto Rico, Guam, or DC
Using pictures of post-birth babies with photoshopped blood in anti-abortion protests
Showing Fox News on the tv at a restaurant
Complaining about loud babies and children in a restaurant
Disliking tv shows, music, and movies that I like
That sounds like a serious BRTD answer.