When can manners can be snobbish?

Answer 1

When they aren't appropriate to the environment.

2nd Answerer- It is not the etiquette, nor the manners, that are appearing snobbish, it is the misuse of them by people that gives the appearance of snobbery.

When people use what they think are good manners as a way of separating themselves from others, it is called "acting pretentious". It is attempting to impress others by "affecting" greater importance, knowledge, culture, etc..., than the others around them. This however backfires, as the people acting this way make themselves appear to be snobbish, or self-absorbed. These people look ridiculous to anyone that actually understands that the root basis of manners, is simply to show self-respect, while showing respect for all others around them and the social situation that he or she is in. They are the same people who usually have "arrogance" and "class" confused.

Acting as if one is better than someone else is simply arrogant. It does not show that one has class. Showing class is treating others with respect, the same way that you would most like to be treated.

Answer 2

Manners are simply a way to act in polite society. Manners are neither snobbish nor crude, they are just a defined set of behaviors that allow everyone to agree on how to act in a way that does not offend others.