You should never be expected to be the bigger person, when you didn't create discomfort in the first place. Too many people cause the chaos themselves, cross the line, then want you to swallow your disappointment and feelings just to keep the peace. 

Nah. Accountability matters. Being mature doesn't mean accepting disrespect or cleaning up messes you didn't make. Sometimes protecting your own peace means standing firm and letting folks sit in the consequences of what THEY caused.