Speak Up But Don’t Argue:

--
A man once asked Imam Ahmad, 'I sometimes find myself in a gathering
where the Sunnah is mentioned, but no-one apart from me has more
knowledge of it. Shall I speak up and say something?'
Imam Ahmad then said, 'State what the Sunnah is, but do not argue over it.'
The man then repeated his statement and so Imam Ahmad said, 'I only
see you to be an argumentative man!'
And this is what Malik (rahimahullah) meant in his saying (after
informing people of the Sunnah), 'Andif they don't accept it from you,
then be silent.'
Mu'tamir ibn Sulayman: 'I heard my father say, 'You can never get a
man to listen to you when you have just angered him.'
- Al-Adab al-Shar'iyyah, by Ibn Muflih al-Maqdisi [pg. 307]
Point of benefit : Advise people of correct actions, the Sunnah, and
the propermanner of conduct etc, but don't push them to the point of
anger and arguments because gettingadvice through to a personin that
state is like trying to force back water flowing from a tap… Instead,
let the heat die down, let the issue close for a while and then try
again when things are calm/ - - -