As I expected..still ignoring me and my comments..and using a pitiful tone with Tom and others.
Please bear in mind that tone is very much a question of interpretation, especially when someone is using what may be a second, third or fourth language. Not everyone has enough experience or cultural familiarity to fit in 100% precisely with the predominant (here meaning, Anglo N American) conventions of politeness.
And, why
should they... many posters here come from places where (for example) a group response including thanks would be considered quite appropriate and sufficient... also maybe,
more thoughtful than to keep bumping the thread repeatedly.
In many countries, it is common and expected that
accidental rudeness or faux pas should be met with understanding and patience - not with sulky rage. This person has clearly transgressed your own guidelines of behaviour, but may nonetheless be obeying different guidelines.
Morality is about how we behave toward others - not about policing how others are to behave toward us... unless this person is your child and your responsibility. So - IMO - better to respect differences, count to ten and bite your tongue.
Politeness
as a human impulse, or as a form of social thoughtfulness is the same all over the world. But what exact kinds of
words or behaviour are considered to be polite or impolite - this varies massively. That's human nature - and we are jointly the richer for that IMHO.
RP