Learn English – How to describe a person who understands jokes, but wouldn’t naturally make jokes

Others may disagree, but I think "glitch" might fit.

• "one minor glitch". and if you're sure it's fixable, say "fixable glitch" .

• If you think the program could be put into use despite the problem, say "it's not a show-stopper".

• If the problem can be documented around, it's "not a bug, it's a feature" (that's an IT joke; not one you would tell a customer.) But seriously, if users could be trained to work around it, "it's a training issue".

• If it's a feature that was in the spec, but can't be delivered in this release, say that it "won't be in the initial rollout", but that it (i.e. getting it working) is "on the wish list for Phase Two".

Since caste in India signifies a social hierarchy, different classes (though I think caste in its meaning is actually stronger than class), possibly

elitist

could be used for members of the upper caste who feel the way you describe. Usually the top of the pyramid look to maintain their status. But elitist possibly doesn't have the strong feeling that

racist

carries. It's unfortunate that racist by definition applies only to race. If different castes were thought of as different races, it might be appropriate with all the connotation associated with it.

** In UK law, discrimination based on caste is being considered as a form of racism, the debate has been going on for years.

Other terms which might be associated with someone who believes in the caste system are

casteist
feudalist

An exponent of caste is someone who promotes the ideas of the caste system
An advocate of caste is someone who promotes the practice of the caste system