To add fuel to the fire
to make a bad situation worse
to add insult to injury
to make a situation worse by humiliating or mocking someone
To agree to disagree
stop arguing because there is no chance of agreement
To pick a fight
to deliberately start a quarrel or fight with someone
bad blood
hostility between people usually coming from past disagreements or conflict
To be on the warpath
to be angry and looking for someone to fight or punish
To have a chip on one's shoulder
to be constantly angry because one thinks one has been treated unfairly
A dirty look
a look that shows dislike or disapproval
To stab someone in the back
to betray someone