sentimentality

what will u do if when u're with few people in conversation n u can heard wat they said?probably 'hah?' n ask the person to repeat right?of coz this' the 1 to frens n in informal way la...
wat if the person purposely talked something in front of u with a hand covered on his mouth to another persons n with eyes looked at u?
since so..i will definitely walked away as tat's the courtesy to give people spaces to chat...
people...if there are any confidential...chat behind la then...who care??
n people..my anger will only arise from others attitude but not words...