After posting Can passengers flying into Thailand do the mandatory 14-day quarantine at home?, someone asked "is this even relevant for "travel"?", to which I replied (mirror):

thanks, travel = "make a journey, typically of some length or abroad." https://google.com/search?q=travel+definition

My comment got deleted by a mod, the reason being (mirror):

remember, Be nice. The doubt whether this fit is real, not every bit of travel knowledge fits this site."

Why was my comment simply thanking a commenter and quoting a definition deleted as not being nice?

After posting Can passengers flying into Thailand do the mandatory 14-day quarantine at home?, someone commented "is this even relevant for "travel"?", to which I replied (mirror):

thanks, travel = "make a journey, typically of some length or abroad." https://google.com/search?q=travel+definition

My comment got deleted by a mod, the reason being (mirror):

remember, Be nice. The doubt whether this fit is real, not every bit of travel knowledge fits this site."

Why was my comment simply thanking a commenter and quoting a definition deleted as not being nice?