i do it all the time

just blunt honest .......say what u think when u think it ..........the only advice i can offer u is to teach yourself to shut up / curve it

1 if u do not have anything nice to say just do not say it
2 get yourself in the habit of saying please and thank u ........my parents got me set on sir and ma'am
3 keep a friend of family member that knows u around to stop u from talking (foot in mouth )
4 sooner or later u will mess up and something will happen keep your wits do not over react .........i keep the excuse i am going outside for a smoke it has saved me more times then i can count .....if u do not smoke then come up with a fall back excuse to get u away from the ppl