You’re a professional. As such, you can’t tell your enemies to f$ck off, slap them in the face, or get them to meet you in the parking lot after school. Cause, you know, you’d probably get fired or face legal...
If you don’t have at least one person within your city’s social and professional circles that you don’t experience a mutual degree of animosity with, then good for you. Seriously. But most of us have that one human capable of really killing our vibe if we show up at the same event. But why let it ruin your night?