10 Answers

....shyness, health, deep thought (emotional reasons/thoughts,) fear

the reasons are endless,and some of the reasons legitimate and some not legitimate..imo,>>>>>>>><<<<<<<<..

it could simply be that the person does not find that other person interesting to them. Also we don't have time to interact with everybody. There are reason we like who we like. There are reasons we don't care for who we don't care for. Don't take it personal. That person may be saving you from wasting valuable time.

If I don't know someone, I'm not likely to sit next to him.

If I don't care for someone, I'm unlikely to sit and talk to him.

maybe the person in question didn't use their deodorant or has halitosis.

Too tired to talk....been talking my head off all day.  

For one, marriage.

A strict Jew will not sit next to a woman unless he is married to her.

Mike Pence seems to have the same idea.

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