What is it called when someone hates disabled people?

I’m having an argument with someone else who keeps telling me that racism is hating any kind of person. He keeps telling me that racism is sexism, etc.

I just want to know what the term for a person that hates disabled people (like mentally or physically disabled people) would be so I can prove him wrong. I know that’s a little ridiculous, but whatever.

There is apparently a word - ableism - which describes people who are prejudiced against the disabled.

The word is confirmed by the OED, with the following meaning:

Discrimination in favour of able-bodied people; prejudice against or disregard of the needs of disabled people.

People who use racist these days to mean nothing more than prejudiced are diluting the brand. According to Oxford Dictionaries Online, a racist is:

A person who shows or feels discrimination or prejudice against people of other races, or who believes that a particular race is superior to another

So racism is about race. Period.

There are various, more specific words for what you are talking about. Per the eponymous Wikipedia entry on handicapism:

Handicapism is a sociological term, which describes a theory and a set of practices that promote unequal and unfair treatment, discrimination and oppression of peoples with apparent or assumed disability, a concept like to racism or sexism.

But then also there is this, again from Wikipedia’s eponymous entry on ableism:

Ableism or ablism (/ˈeɪblɪzəm/) is a form of discrimination or social prejudice against people with disabilities. It may also be referred to as disability discrimination, ablecentrism, physicalism, handicapism, and disability oppression. It includes apotemnophobia and dysmorphophobia. It is also sometimes known as disablism, although there is some dispute as to whether ableism and disablism are synonymous, and some people within disability rights circles find the latter term’s use inaccurate. Discrimination faced by those who have or are perceived to have a mental disorder is sometimes called mentalism rather than ableism.

But if you really want to get somebody’s dander up, you could call them a crippist: someone displaying prejudice against the crippled.

Your friend is obviously misinformed and the word for hatred of disabled is ableism, ageism for those whom are older, transmisia for those who are transgender, and Homomisia for hatred of gay people.