"I begin to grow heartily tired of the etiquette and nonsense so fashionable in this city"

This quote by George Mason is a reflection of his frustration with the social standards of the city he was residing in. He is expressing his aggravation with the superficiality of the rules and nonsense that is so popular in the city. He is most likely describing the emphasis on appearances and the importance of following certain social rules and conventions. He is most likely feeling overwhelmed by the pressure to conform to these requirements and is growing tired of the lack of credibility and sincerity that comes with them. He is likely longing for a more genuine and meaningful connection with individuals around him, rather than the shallow and insincere interactions that are so typical in the city.