I used to deal with a lot of disgruntled employees.  When you're in a leadership role, one of the best ways to get through to someone is to show them you're not perfect.  It helps them relax instead of viewing you as some kind of idol standing high on a pedestal.  A few f-bombs, when used calmly, and a no bullshit attitude often puts the disgruntled employee at ease.  Sometimes they'll laugh, and some of the angry emotions they were experiencing dissipates.  Then you can get down to brass tacks and talk to these people as equals.  They'll open up more instead of making things worse.

Personally, I don't look down on people when they choose to speak their own language.  But hey, I was only joking with my response to you.  We don't need to fight about this shit.  We're far too cool for that.