As somebody said earlier airline pilots wear stripes to be recognised by passengers and crew especially in an emergency situation. Hopefully in a C152 your student should not have a problem recognising you in a similar situation. Respect does not come from how many stripes you have, but it comes from consistently operating to a high standard. If you think that stripes are the only way you will get respect I am afraid you must be doing something wrong. Oh and by the way if there were no airline pilots you would not have any pilots to train in the first place.