To have a chip on one's shoulder
to be constantly angry because one thinks one has been treated unfairly
To add fuel to the fire
to make a bad situation worse
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
A dirty look
a look that shows dislike or disapproval
To be on the warpath
to be angry and looking for someone to fight or punish
To stab someone in the back
to betray someone
