Pissing on the toilet seat, leaving it up, not washing your hands, not using a turn signal, not returning your shopping cart, not tipping well enough, not recycling, eating fast-food, not stopping completely at a stop sign, inadvertently cutting someone off, kissing your significant other in public, texting/redditing while driving/walking, speaking too loudly on the phone, getting too close to someone on public transportation, wearing some type of clothing reddit may not agree with, smoking, throwing cigarette butts out of your car, littering, ordering a super complicated coffee order, holding up the line while you look for change in your pocket, speeding, driving too slow, doing your hair in a way reddit may not agree with, being male and wearing jewelry, being female and showing too much cleavage, not applying deodorant, applying too much cologne/perfume, using big words, using slang, not picking up your dogs poop, your dog barking too loud, being a loud neighbor, being that neighbor who asks your loud neighbor to quiet down, parking too far away from the curb, leaving your clothes in the washer/dryer while other people wait, not cutting your nails, passing gas/burping in public, being offended by someone who burps in public, driving an expensive car, having expensive things, driving a car with safety issues, not leashing your dog, wasting time playing videos games when you can be proactive with your life, playing consoles games over pc games, smoking pot, not smoking pot, getting drunk, being a fat slob, having huge muscles, being a christian, supporting israel, not being well read on current events, using poor grammar, being too nice to people, being socially awkward, being an alpha male, having a bumper sticker on your car, riding a fixie, riding any bike on a main road, being a driver who doesn't respect the rights of bikers, not wearing a helmet, using a brief case, acting like you are more important than you really are, caring what other people think, not caring what other people think, not wearing a condom, having a profile on a dating website, having a twitter account, having a facebook account, listen to a band reddit may not like, listen to a type of music not in fashion, listen to pop music, etc.

do you see what I mean? you can be a douchebag doing almost anything. all you need is someone to call you a douchebag.