Personal space, on an aircraft etc or public transport I want to be left alone, I put my nose in my book or obviously have music on (the player out and visible in case they miss the ear buds). Some people want to start conversations though, others wouldn't care if you were a corpse as long as you were quiet... it all depends on the type of person and what they do.
In this case you could probably have tried a conversation starter (gum being offered is normally a formality where you expect them to say no, but its polite to offer), if he responded then he is likely a talker, otherwise you probably want to stay quiet and to yourself otherwise he will go home after a terrible 5 hr trip (once got stuck talking to an annoying girl on a 12 hr flight... she wouldn't shut up and wouldn't let me read, I was tempted to move seat, but had an exit row so nothing better existed).
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