Being the 'strong, silent type' only works if you are handsome. People don't want to explore if there is any depth to you if you're not aesthetically pleasing.
I am sure more good looking people get away with horrible personalities.
Wearing more revealing clothes
Making a lot of eye contact or smiling at a stranger
Weirdly, being polite to the opposite sex. I'm generally a very polite and friendly person. When I was fat, men would constantly go out of their way to make sure I knew they had no interest even though I hadn't given any hint at being interested and was already in a relationship. Now that I've lost weight everyone's a LOT nicer.
Walt Disney Pictures
Being socially forward. Interrupting people while talking, hitting on people, giving unsolicited advice, etc. Being attractive gives you an automatic +1 to charisma.
Warner Bros Pictures
Dressing down for an occasion. For example, hot guy can wear jeans to a semi-formal event and pull it off, looks fine, no worries. Ugly guy wears jeans to a semi-formal event, and he looks lazy and underdressed.
Winking Seductively. Just...no
Flirting is basically treated like harassment if you're ugly.
Taking your shirt off.
Wearing really short skirts. It's summer and plenty of people wear them.
But when I wear them, "I can't allow you to enter our restaurant dressed like this, sir."
20th Century Fox
Be persistent in pursuit of your crush. At least in movies, anyways.
20th Century Fox
Bothering people who are reading. After years of sitting in coffee shops reading, I realized I was curt with anyone who tried to engage me in conversation, unless they were an attractive girl.
If you're attractive, then you're "cute" or "sweet" or "reserved".
If you're ugly, then you're "awkward" or "creepy" or "have no life".
Apparently cheating. I Know a girl that's very very attractive. She was cheating on her boyfriend, her one friend wholly supported it. Said "Sometimes someone better comes along." My wife seemed to want to give the girl the benefit of the doubt. She said "We can't consider her the bad guy here. We don't know her whole story. Maybe her current boyfriend is abusive."
When a beautiful person is crying everyone is concerned and consoling.
Ugly people cry no one cares and acts like they aren't there.
That ugly mole somewhere in the vicinity of the nose/mouth. It's a mole, not a beauty mark.
Assuming people want to interact with you
Being lazy/unemployed or working a bad job. Attractive people tend to get the "he/she is finding their way in life" excuse, as though the only reason they're working at KFC is to afford their modelling/sports career. Others just get "he/she needs to stop being so lazy and get a real job." People are too judgemental.
Being rude to bar staff. I've seen weapons-grade beauties get away with awful manners whilst we ordinary folk must say please and thank you just to get a warm beer in a dirty glass.
Warner Brothers Television
Saying you're ugly. If you're actually ugly you just end up making everyone uncomfortable. If you're beautiful people tend to fall all over themselves trying to reassure you that you're beautiful.
People will tolerate a great deal of weirdness, strangeness and psycho behaviour from an attractive person, whereas these traits would be unforgivable in an ugly person.
There was a social experiment conducted where a catfish profile of a beautiful blonde was created. When guys talked to her the catfishers responded with the most weird, bizzarre, off-the-wall, creepy answers but guys still kept pursuing.
People are psychologically more inclined to believe someone good looking is skillfull at whatever they're claiming to good at, despite no evidence. In fact there's something called the 'halo effect' that says along with beauty come all sorts of other positive characteristics. We have a tendency to think beautiful people are funnier, more friendly, more intelligent, more exciting, in possession of better social skills, are more interesting, poised and even more independent.
Going on about how inner beauty is more important than outer beauty. If you're attractive and say this you're humble and empowering, but if you're ugly and say it, you're just seen as whining.