Origional Answer: It just feels wrong and its machure!
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While initially hats were made for a variety of purposes, perhaps the largest reason was for the protection of the head from the weather.
By and large, people will usually employ the short and straight utilitarian model of thinking, hence the reason why it is customary to wear hats only when serving a common purpose. Abstract logic applied on a higher or lower tier of thinking would suggest otherwise though. Hats employed as a religious tool, or also used in non- widespread spiritual purposes are the lesser common uses of hats. Medical circumstances are another reason a hat may be worn indoors. Perhaps the rarest justification for wearing a hat indoors, is the affiliation or connection to ones body... Some people accept the hat as being an actual part of their body, or the hat may compensate for hair loss and lost youth. Even still, the hat may be looked upon as being no different than a shirt or pair of pants.
-Note: Hats only being considered acceptable indoors is merely a long held perception of the Collective Human Organism. To enforce this perception into reality either on the social, business, or on another layer; would be disparate to any individuals or groups outside of the perception.
Finally: Wearing a hat indoors is the same as wearing the same hat outdoors.
Wearing a hat indoors is practically and morally balanced.
The only case it might be rude is when the hat blocks another person's view in a theater or auditorium.
No means you have 2 jobs/responsibilities- your "wear 2 hats"
The bad bugs usually wear black hats.
In general, it is considered rude for a man to wear a hat indoors.
Slurping is bad manners. You will not be arrested for bad manners.
Humans commit bad manners when they are angry, irritated, or maybe just haven't learned the REAL manners.
It has bad stable manners
having a hat or coat on at the table is like saying you want to hurry up and get out.
Gosh It's... Bad Manners was created in 1981-09.
Inappropriate dress, interrupting a person in mid-sentence and talking while the mouth is full of food or drink are considered bad manners in Suriname.Specifically, the Surinamese tend to dress coolly but elegantly in the capital and larger cities. It is considered bad manners to wear beach attire on the street and in public buildings. Additionally, it is considered bad manners to behave as one may when so attired: interrupting other people's conversations and talking while not finished chewing or swallowing.
Stupidity - Bad Manners album - was created on 2003-06-17.
The Collection - Bad Manners album - was created on 1998-03-10.
Mental Notes - Bad Manners album - was created in 1985.