DEAR MISS MANNERS: I traveled by bus to attend a funeral for a family member in my hometown (where I no longer live). I don’t mind riding the bus, and in fact, I relish the chance to listen to a podcast or audiobook and unwind. The bus ride was about two hours, and I was seated next to a woman whom I could not, despite my best and most mannerly efforts, disengage from conversation. Should something like this happen in the future, what is a polite but FIRM way to disengage a chatty stranger, short of simply putting in my earbuds and ignoring him or her? GENTLE READER: The rude person on the bus…