Explanation
In the United Kingdom, pointing with your index finger is generally considered impolite or aggressive in social settings, especially when directed at a person. It is more acceptable in informal contexts or when pointing at objects, but many Britons prefer a nod or an open hand gesture to avoid appearing rude.
Local Tip
Instead of pointing, gesture with your whole hand or nod your head in the direction you mean.
How it compares elsewhere
Pointing with the index finger is considered very rude; use an open hand instead.
Pointing with the index finger is common and generally acceptable in casual settings.
Pointing with the index finger is offensive; use the thumb or an open hand.