I have always though no it is not, but I have learned that it is possible for this to happen. You see, it is very easy for your body to be some where and for your mind to be somewhere else. In fact, it is very easy for your mind to be in another place and time either the future, present or the past.
When your mind is somewhere your body is not you do a huge disservice to yourself and those around you. Not only is your mind not engaged in the present with your body, but you are not participating with the people around you. If you think hard enough about it, it is rather rude to others and to yourself.
Being present in mind and body will be more rewarding and will not tick off the people you are with.