Chapter 3: Page 15: Lines 27-29 (118-120)

 Is it too many nights alone on top of that fam'd Hill in Greenwich? can this man, living in one of the great Cities of Christendom, not know how to behave around people?— Dixon decides to register only annoyance.

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Lines 118-120 Vulgarized:
"Has spending too many nights all by himself immersed in the grotesque spectacle of public executions rendered Mason, a man surrounded by other city folk, other professed Christians and urbane Londoners, unable to politely socialize with other people?" Dixon thinks while making a sour face at Mason's rude impression of Dixon's fellow country folk.

Subtext:
Mason might be autistic. He shows an almost obsessive joy concerning the public executions, believing everybody would (and should) enjoy the spectacle as much as he does. He also doesn't seem to register that his speech mimicking Durham County residents might come off as insulting, especially when speaking directly to a Durham County resident. He's doing an exaggerated accent in the face of a guy who is speaking in that accent.
    I don't mean to suggest that autistic people are rude! I don't think Mason is trying to be rude here at all, which is why the suggestion that he's autistic. Dixon's confusion about how somebody living in the city, living around people, might not understand social niceties strongly suggests that Mason doesn't think in the same way most folk might think.
    Rather than getting upset with Mason, Dixon just "decides to register only annoyance." This is a good move on Dixon's part, not turning what is probably an innocent slight into an argument. On the other hand, if Mason is autistic, he's almost certainly not going to register the register of annoyance.
    All in all, it's a first meeting and Dixon seems to handle Mason's initial eccentricities politely. Dixon, the more outgoing and extroverted of the two, realizes they're going to be working together for quite a while and decides to forgive Mason's social misstep here in the hopes of the two of them continuing to get along in the long run.