Truth is I NEVER had a ‘friend’ at work. Work is work. I do not socialize there (and never have). Those who want friendship should ask someone to coffee after the work day is over. That keeps it simple
I tend to approach work the same way. It's all business, i.e. trying best to apply and better myself in the interest of serving my employer. With all the PC crap these says, however, I often envision doing something outrageous, like pinning a lone, little patch on my otherwise impeccably clean cubicle walls: