Discrimination

Discrimination means unfair treatment of a person or group on the basis of prejudice. Most, if not all, discriminations are named base on the victim. For example, a free thinker and completely ordinary person discriminates a Christian, it's called discrimination against religion; a physically normal person discriminates a person who is visually impaired, it's called discrimination against disability. I categorise discriminations under against intrinsic or extrinsic characteristics. Intrinsic refers to innate characteristics that are usually unchangeable. Extrinsic, on the other hand, refers to things not given upon birth and could be changed. I do admit, however, that the categories are quite ambiguous. For example, with modern technology, it is possible to change the gender via transsexual operation and its sometimes unclear whether gender is an intrinsic or extrinsic characteristic.

Intrinsic
1)Ancestry. One person might be a descendant of a notorious person in history, and many might think that he would follow the footsteps of his ancestors and thus discriminate him.
2)Race. Negroes were once discriminated in America and they were not granted many rights.
3)Gender. Many believe girls are better behaved than boys; therefore boys usually get a harsher scolding for committing a same offence as a girl.
4)Disability. Many look down on the physically disabled and think that they are inferior to them. Some of them might even rub salt into their wounds by insulting them.
5)Psychological disorder. Many mock the weird actions of the mentally unsound and also look down on them.
6)Age. People believe that old man are usually unable to do manual labour and therefore they never allow them to do so even if they can.
7)Intelligence. People believe others of inferior intellect are inferior to them in other ways too. THey even insult the intellectually inferior.
8)Appearance( face, etc). Some people judge the book by it's cover and believe that people with particular looks are immoral and therefore habour feelings of hate against them.
9)Family. People might believe in things such as 'like father, like son'.

Extrinsic
1)Education. A person who has been taught by an elite school would think that another person taught by an ordinary school is inferior to him and hence look down on him. He might even take some actions against the person taught by an ordinary school just to prove that he is superior.
2)Reverse Discrimination. A person might hate someone discriminating him and decides to let him 'have a taste of his own medicine'.
3)Political Affiliation. A person might from a stereotype-based prejudice against someone with a particular political belief. For example, he could say that 'all anarchists are violent', and starts insulting them.
4)Employment. People might discriminate others based on their jobs. For example, cleaners are stereotyped as smelly and dirty people. Some people intentionally avoid them or even purposely cover their nose in disgust when walking past them.
5)Nationality. Some people insult others based on their nationality. Europeans once discriminated Africans and Asians and bought them as slaves.
6)Marital status. People might think that old unmarried people are incapable of marriage and thus insult them for being incapable.
7)Social Status. People might hate the rich simply because they are richer and discriminate them.
8)Appearance(clothes, etc). (Same as 'appearance(face,etc.)')
9)Religion. Hitler once discriminated the Jews and massacred them.
10)Reverse reverse discrimination.

Of course, there are many other forms of discrimination that are not typed above.Also note that the discriminations might sometime be against two characteristics of the victim, for example, people might discriminate the child of a rich person because they are jealous of the comfort he enjoys. In this case it's discrimination against social status of family.