Why do some people that work from treat people that don't work from home like they're less than or unimportant?

I currently don't work from, I work as a library assistant. It's not that I wouldn't work from at some point, I just haven't found one yet. However I'm not mad about working where I'm at or working out of the house for now. I can go either way. When I speak to my sister or other people that work from home, they talk to me about everything that's wrong with me not working at home. They make me feel like my job is less than or not as important as theirs. They also express how stupid I am that I don't work from home. Why do SOME (not everyone) people that work from home do this?

Why do some people that work from treat people that don't work from home like they're less than or unimportant?
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