Just because they are sharing their table, it does not mean they are sharing a conversation
Sharing tables with complete strangers might be unpleasant for many people. You never know if someone is a chatterer, and you would be forced to either suffer through some idle discussion just because you did not know how to say ‘No talking, please.’ In any case, we all wish we could be as direct as this person.
He is correct. Only sitting and sharing space were covered under the agreement. It did not include talking or interacting. That is something that people must comprehend; just because you are sharing a place, it does not mean you have to do anything more than that.