Use 'bugbear' to express regular frustrations or problems in daily life, especially petty ones. Traffic jams are my ultimate bugbear during the morning commute.
Pro Tip 2/3
Not Severe
'Bugbear' implies annoyance, but not anything deeply upsetting or life-changing. His constant whistling is a bugbear of mine, but I'll survive.
Pro Tip 3/3
Can be Humorous
Sometimes 'bugbear' is used in a light, humorous way to show that you're not seriously troubled. My friend's obsession with punctuality is a bit of a bugbear to our laid-back group.